Wall Street ends slightly down, S&P positive for seventh week

NEW YORK (Reuters) - The S&P 500 dipped in a late decline on Friday as Wal-Mart dropped following a report of a weak start to February sales, though the index just barely extended its streak of weekly gains to seven.

Equities were little changed for much of the session, with investors finding few reasons to make big bets following an extended rally on Wall Street, but stocks turned lower in afternoon action.

Wal-Mart Stores Inc dropped 2.1 percent to $69.30 after Bloomberg News reported a weak start to February sales, citing internal company e-mails. The stock was the biggest decliner on the Dow, while the S&P retail index <.spxrt> fell 0.5 percent.

"When a retailer of this size comes out with this kind of lousy news, the whole market can fall off, especially on a Friday afternoon," said Mike Shea, trader at Direct Access Partners in New York. "However, I'm not worried that this is indicative of any larger macro issue with retail."

Equities have struggled for direction recently, with major indexes moving only slightly in the past several sessions. The S&P didn't end a session with a move greater than 0.2 percent at all this week.

The benchmark index, up 6.6 percent so far this year, is facing strong technical resistance near the 1,525 level. But investors, expecting the index to advance further in the quarter, have held back from locking in profits.

"There's no news that suggests the strong underpinning for stocks isn't appropriate. We may have gotten ahead of ourselves, but there's also an absence of bad news," said Mark Luschini, chief investment strategist at Janney Montgomery Scott in Philadelphia.

Many investors are starting to look ahead to a debate in Washington over sequestration, automatic across-the-board spending cuts put in place as part of a larger congressional budget fight. The cuts are due to kick in March 1 unless lawmakers agree to an alternative.

"This had been far enough out to not yet become an impediment for stocks, but it will start to move into the forefront and cause people to take a bit of a jaundiced eye towards the market," said Luschini, who helps oversee about $54 billion in assets.

The Dow Jones industrial average <.dji> was up 11.27 points, or 0.08 percent, at 13,984.66. The Standard & Poor's 500 Index <.spx> was up 0.32 points, or 0.02 percent, at 1,521.70. The Nasdaq Composite Index <.ixic> was up 1.51 points, or 0.05 percent, at 3,200.17.

For the week, both the Dow and Nasdaq fell 0.1 percent while the S&P rose 0.1 percent in its seventh straight week of gains, a period during which the index rose 8.4 percent. The last such seven-week run was between December 2010 and January 2011.

The New York Federal Reserve said manufacturing in New York state expanded for the first time in seven months, while Thomson Reuters/University of Michigan's preliminary reading of consumer sentiment rose from the prior month and beat expectations.

But U.S. manufacturing fell in January after a rise in the prior month.

Wall Street's gain thus far in 2013 has largely been driven by strong corporate earnings, while data indicated some weakening in economic conditions.

A surge in merger and acquisition activity, with more than $158 billion in deals announced so far in 2013, has given further support to the equity market as it points to healthy valuations and bets on the economic outlook.

Herbalife shares cut earlier gains to rise 1.2 percent to $38.74. Late Thursday, billionaire investor Carl Icahn said in a regulatory filing that he now owns 13 percent of Herbalife and was ready to put it in play.

MeadWestvaco Corp climbed 12.5 percent to $35.65 as the biggest percentage gainer on the S&P index after activist investor Nelson Peltz's Trian Fund Management LP said it had bought about 1.6 million shares of the packaging company.

Burger King Worldwide shares gained 4.7 percent to $17.36 after it beat estimates with a 94 percent rise in fourth-quarter profit, thanks to new menu additions.

Oil service stocks declined, weighed by a 5.1 percent drop in shares of Transocean to $56.26, after the rig contractor reported its fleet update and Deutsche Bank cut its rating on the stock to "sell." The PHLX oil service sector <.osx> lost 1.5 percent.

Slightly more stocks fell than rose on the New York Stock Exchange while about 50 percent of Nasdaq shares ended lower. About 6.69 billion shares changed hands on the New York Stock Exchange, the Nasdaq and NYSE MKT, above the daily average so far this year of about 6.48 billion shares.

(Editing by Nick Zieminski)

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Exclusive: North Korea tells China of preparations for fresh nuclear test - source

BEIJING (Reuters) - North Korea has told its key ally, China, that it is prepared to stage one or even two more nuclear tests this year in an effort to force the United States into diplomatic talks, said a source with direct knowledge of the message.

Further tests could also be accompanied this year by another rocket launch, said the source, who has direct access to the top levels of government in both Beijing and Pyongyang.

North Korea conducted its third nuclear test on Tuesday, drawing global condemnation and a stern warning from the United States that it was a threat and a provocation.

"It's all ready. A fourth and fifth nuclear test and a rocket launch could be conducted soon, possibly this year," the source said, adding that the fourth nuclear test would be much larger than the third, at an equivalent of 10 kilotons of TNT.

The tests will be undertaken, the source said, unless Washington holds talks with North Korea and abandons its policy of what Pyongyang sees as attempts at regime change.

North Korea also reiterated its long-standing desire for the United States to sign a final peace agreement with it and establish diplomatic relations, he said. North Korea remains technically at war with both the United States and South Korea after the Korean war ended in 1953 with a truce.

In Washington, U.S. State Department spokeswoman Victoria Nuland urged North Korea to "refrain from additional provocative actions that would violate its international obligations" under three different sets of U.N. Security Council resolutions that prohibit nuclear and missile tests.

North Korea "is not going to achieve anything in terms of the health, welfare, safety, future of its own people by these kinds of continued provocative actions. It's just going to lead to more isolation," Nuland told reporters.

The Pentagon also weighed in, calling North Korea's missile and nuclear programs "a threat to U.S. national security and to international peace and security."

"The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region," said Pentagon spokeswoman Major Catherine Wilkinson.

Initial estimates of this week's test from South Korea's military put its yield at the equivalent of 6-7 kilotons, although a final assessment of yield and what material was used in the explosion may be weeks away.

North Korea's latest test, its third since 2006, prompted warnings from Washington and others that more sanctions would be imposed on the isolated state. The U.N. Security Council has only just tightened sanctions on Pyongyang after it launched a long-range rocket in December.

Pyongyang is banned under U.N. sanctions from developing missile or nuclear technology after its 2006 and 2009 nuclear tests.

North Korea worked to ready its nuclear test site, about 100 km (60 miles) from its border with China, throughout last year, according to commercially available satellite imagery. The images show that it may have already prepared for at least one more test, beyond Tuesday's subterranean explosion.

"Based on satellite imagery that showed there were the same activities in two tunnels, they have one tunnel left after the latest test," said Kune Y. Suh, a nuclear engineering professor at Seoul National University in South Korea.

Analysis of satellite imagery released on Friday by specialist North Korea website 38North showed activity at a rocket site that appeared to indicate it was being prepared for a launch (http://38north.org/2013/02/tonghae021413/).

NORTH 'NOT AFRAID' OF SANCTIONS

President Barack Obama pledged after this week's nuclear test "to lead the world in taking firm action in response to these threats" and diplomats at the U.N. Security Council have already started discussing potential new sanctions.

North Korea has said the test was a reaction to "U.S. hostility" following its December rocket launch. Critics say the rocket launch was aimed at developing technology for an intercontinental ballistic missile.

"(North) Korea is not afraid of (further) sanctions," the source said. "It is confident agricultural and economic reforms will boost grain harvests this year, reducing its food reliance on China."

North Korea's isolated and small economy has few links with the outside world apart from China, its major trading partner and sole influential diplomatic ally.

China signed up for international sanctions against North Korea after the 2006 and 2009 nuclear tests and for a U.N. Security Council resolution passed in January to condemn the latest rocket launch. However, Beijing has stopped short of abandoning all support for Pyongyang.

Sanctions have so far not discouraged North Korea from pursuing its nuclear ambitions.

"It is like watching the same movie over and over again," said Lee Woo-young, a professor at Seoul's University of North Korean Studies. "The idea that stronger sanctions make North Korea stop developing nuclear programs isn't effective in my view."

The source with ties to Beijing and Pyongyang said China would again support U.N. sanctions. He declined to comment on what level of sanctions Beijing would be willing to endorse.

"When China supported U.N. sanctions ... (North) Korea angrily called China a puppet of the United States," he said. "There will be new sanctions which will be harsh. China is likely to agree to it," he said, without elaborating.

He said however that Beijing would not cut food and fuel supplies to North Korea, a measure it reportedly took after a previous nuclear test.

He said North Korea's actions were a distraction for China's leadership, which was concerned that the escalations could inflame public opinion in China and hasten military build-ups in the region.

The source said he saw little room for compromise under North Korea's youthful new leader, Kim Jong-un. The third Kim to rule North Korea is just 30 years old and took over from his father in December 2011.

He appears to have followed his father, Kim Jong-il, in the "military first" strategy that has pushed North Korea ever closer to a workable nuclear missile at the expense of economic development.

"He is much tougher than his father," the source said.

(Additional reporting by Arshad Mohammed and Phillip Stewart in WASHINGTON; Writing by David Chance; Editing by Raju Gopalakrishnan, David Brunnstrom and Jackie Frank)

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Samsung to reportedly take on BlackBerry with new enterprise platform

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Beyoncé: I Would Not Be the Woman I Am Without Jay-Z

Beyoncé is one smitten starlet.

The notoriously private performer, 31, recently got candid with Oprah, and gushed about the love of her life, husband Jay-Z, 43.

"I would not be the woman I am if I did not go home to that man," the new mom said firmly, almost as if she she was about to get teary-eyed. "It just gives me such a foundation. [He's helped me] on so many levels."

But it wasn't love at first sight for the power pair.

"We were friends first for a year and a half before we went on any dates," Beyoncé explains. "We were on the phone for a year and a half, and that foundation is so important for a relationship. Just to have someone who you just like is so important, and someone [who] is honest."

For the longest time, the couple refused to address their marriage to media, and that is something the talk show host finds particularly amusing.

"I remember the first time you were on the Oprah show, I told you, 'Don't go around telling people who you're dating,' " Oprah recalls. "I think you took that all the way. Don't tell people who you're dating, but you can tell people who you're married to, OK?"

The singer is set to get even more personal in her Life Is But a Dream documentary, airing Saturday night on HBO. In an already-featured clip from the highly anticipated documentary, Beyoncé revealed she miscarried before giving birth to Blue Ivy.

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Study: Fish in drug-tainted water suffer reaction

BOSTON (AP) — What happens to fish that swim in waters tainted by traces of drugs that people take? When it's an anti-anxiety drug, they become hyper, anti-social and aggressive, a study found. They even get the munchies.

It may sound funny, but it could threaten the fish population and upset the delicate dynamics of the marine environment, scientists say.

The findings, published online Thursday in the journal Science, add to the mounting evidence that minuscule amounts of medicines in rivers and streams can alter the biology and behavior of fish and other marine animals.

"I think people are starting to understand that pharmaceuticals are environmental contaminants," said Dana Kolpin, a researcher for the U.S. Geological Survey who is familiar with the study.

Calling their results alarming, the Swedish researchers who did the study suspect the little drugged fish could become easier targets for bigger fish because they are more likely to venture alone into unfamiliar places.

"We know that in a predator-prey relation, increased boldness and activity combined with decreased sociality ... means you're going to be somebody's lunch quite soon," said Gregory Moller, a toxicologist at the University of Idaho and Washington State University. "It removes the natural balance."

Researchers around the world have been taking a close look at the effects of pharmaceuticals in extremely low concentrations, measured in parts per billion. Such drugs have turned up in waterways in Europe, the U.S. and elsewhere over the past decade.

They come mostly from humans and farm animals; the drugs pass through their bodies in unmetabolized form. These drug traces are then piped to water treatment plants, which are not designed to remove them from the cleaned water that flows back into streams and rivers.

The Associated Press first reported in 2008 that the drinking water of at least 51 million Americans carries low concentrations of many common drugs. The findings were based on questionnaires sent to water utilities, which reported the presence of antibiotics, sedatives, sex hormones and other drugs.

The news reports led to congressional hearings and legislation, more water testing and more public disclosure. To this day, though, there are no mandatory U.S. limits on pharmaceuticals in waterways.

The research team at Sweden's Umea University used minute concentrations of 2 parts per billion of the anti-anxiety drug oxazepam, similar to concentrations found in real waters. The drug belongs to a widely used class of medicines known as benzodiazepines that includes Valium and Librium.

The team put young wild European perch into an aquarium, exposed them to these highly diluted drugs and then carefully measured feeding, schooling, movement and hiding behavior. They found that drug-exposed fish moved more, fed more aggressively, hid less and tended to school less than unexposed fish. On average, the drugged fish were more than twice as active as the others, researcher Micael Jonsson said. The effects were more pronounced at higher drug concentrations.

"Our first thought is, this is like a person diagnosed with ADHD," said Jonsson, referring to attention deficit-hyperactivity disorder. "They become asocial and more active than they should be."

Tomas Brodin, another member of the research team, called the drug's environmental impact a global problem. "We find these concentrations or close to them all over the world, and it's quite possible or even probable that these behavioral effects are taking place as we speak," he said Thursday in Boston at the annual meeting of the American Association for the Advancement of Science.

Most previous research on trace drugs and marine life has focused on biological changes, such as male fish that take on female characteristics. However, a 2009 study found that tiny concentrations of antidepressants made fathead minnows more vulnerable to predators.

It is not clear exactly how long-term drug exposure, beyond the seven days in this study, would affect real fish in real rivers and streams. The Swedish researchers argue that the drug-induced changes could jeopardize populations of this sport and commercial fish, which lives in both fresh and brackish water.

Water toxins specialist Anne McElroy of Stony Brook University in New York agreed: "These lower chronic exposures that may alter things like animals' mating behavior or its ability to catch food or its ability to avoid being eaten — over time, that could really affect a population."

Another possibility, the researchers said, is that more aggressive feeding by the perch on zooplankton could reduce the numbers of these tiny creatures. Since zooplankton feed on algae, a drop in their numbers could allow algae to grow unchecked. That, in turn, could choke other marine life.

The Swedish team said it is highly unlikely people would be harmed by eating such drug-exposed fish. Jonsson said a person would have to eat 4 tons of perch to consume the equivalent of a single pill.

Researchers said more work is needed to develop better ways of removing drugs from water at treatment plants. They also said unused drugs should be brought to take-back programs where they exist, instead of being flushed down the toilet. And they called on pharmaceutical companies to work on "greener" drugs that degrade more easily.

Sandoz, one of three companies approved to sell oxazepam in the U.S., "shares society's desire to protect the environment and takes steps to minimize the environmental impact of its products over their life cycle," spokeswoman Julie Masow said in an emailed statement. She provided no details.

___

Online:

Overview of the drug: http://www.nlm.nih.gov/medlineplus/druginfo/meds/a682050.html

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Wall Street ends slightly higher, helped by acquisitions

NEW YORK (Reuters) - The S&P 500 eked out a small gain for a third straight session on Thursday, helped by a flurry of merger activity, though investors see no catalysts to lift the market further with major averages near multi-year highs.

The market's slowed advance took the S&P 500 to its highest intraday level since November 2007 on Wednesday. While the index notched its third straight day of gains, none was more than 0.2 percent.

Shares of H.J. Heinz Co jumped 20 percent to $72.50 after it said Warren Buffett's Berkshire Hathaway and 3G Capital will buy the food company for $72.50 a share, or $28 billion including debt. Berkshire's class B shares rose 1.3 percent to $99.21.

Also supporting the market was data showing the number of Americans filing new claims for unemployment benefits fell more than expected in the latest week. The CBOE Volatility index <.vix> fell 2.4 percent, dropping to 12.67.

"While I'm not bearish, I don't see many upside motivations at these levels," said Donald Selkin, chief market strategist at National Securities in New York, who cited the low level of the VIX as a sign the market was overbought.

Equities have struggled to break above current levels where they have been hovering for almost two weeks. The S&P 500 is up more than 6 percent so far this year.

"We need to digest some of our gains to go higher, but people are so eager to buy on the dips that we're not even seeing dips anymore. People are just chasing the market higher," said Selkin, who helps oversee about $3 billion in assets.

Stocks fell earlier after a report the euro zone's gross domestic product contracted by the steepest amount since the first quarter of 2009. In addition, Japan's GDP shrank 0.1 percent in the fourth quarter, crushing expectations of a modest return to growth.

The Dow Jones industrial average <.dji> was down 9.52 points, or 0.07 percent, at 13,973.39. The Standard & Poor's 500 Index <.spx> was up 1.05 points, or 0.07 percent, at 1,521.38. The Nasdaq Composite Index <.ixic> was up 1.78 points, or 0.06 percent, at 3,198.66.

Constellation Brands soared 37 percent to $43.75 after AB InBev's deal to take over Mexican brewer Grupo Modelo was revised to grant Constellation perpetual rights to distribute Corona and other Modelo brands in the United States. U.S. shares of AB InBev gained 5.1 percent to $92.77.

American Airlines and US Airways Group said they plan to merge in a deal that will form the world's biggest air carrier, with an equity valuation of about $11 billion. US Airways shares fell 4.6 percent to $13.99.

Weakness in Europe contributed to a 5 percent drop in revenue from the region for Cisco Systems , which nonetheless beat estimates as it reported its results late Wednesday. The company's shares dipped 0.7 percent to $20.99.

General Motors Co reported a weaker-than-expected fourth-quarter profit, also citing bigger losses in Europe alongside lower prices in its core North American market. The stock was off 3.3 percent to $27.73.

Only five more stocks rose than fell on the New York Stock Exchange, while 51 percent of Nasdaq-listed shares closed higher.

Volume was light, with about 6.36 billion shares changing hands on the New York Stock Exchange, the Nasdaq and NYSE MKT, below the daily average so far this year of about 6.48 billion shares.

(Editing by Nick Zieminski and Kenneth Barry)

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Key U.S. general backs keeping Afghan forces at peak strength

WASHINGTON (Reuters) - The U.S. general nominated to oversee a vast region that includes Afghanistan on Thursday backed keeping Afghan forces at a peak strength of 352,000, contrary to current plans to shrink them after NATO declares the war over next year.

General Lloyd Austin, nominated to lead the U.S. military's Central Command, said at his Senate confirmation hearing that a more robust Afghan force, while more costly, would "hedge against any Taliban mischief" following America's longest war.

"Keeping the larger-size force would certainly reassure the Afghans, it would also reassure our NATO allies that we remain committed," Austin said.

The comments came two days after President Barack Obama announced in his State of the Union address that 34,000 U.S. troops - roughly half of the current U.S. force in Afghanistan - would be withdrawn by early 2014.

Obama reassured Americans that the costly, unpopular war was coming to an end, but he left unanswered bigger questions about America's exit strategy, including how many U.S. troops would stay in the country beyond 2014 to help train and advise the Afghans and to battle remnants of al Qaeda.

Obama also did not discuss the future size of the Afghan forces, although a White House fact sheet sent out after his address noted they would remain at 352,000 until "at least" early 2015.

Austin warned the Taliban would be waiting to test them.

"You could reasonably expect that an enemy that's been that determined, that agile, will very soon after we transition begin to try to test the Afghan security forces," Austin said.

Under current plans, the United States and its NATO allies will help build up the Afghan armed forces to 352,000 personnel, a number they are approaching, but the size of the force - which the allies will continue to fund - will be trimmed to 230,000 after 2015.

ECHOES OF IRAQ

The hearing frequently moved away from questions about the Afghan war and other current events to questions about Austin's past role as commander in Iraq, when a failure to strike an immunity deal for U.S. troops led to their total withdrawal in 2011.

Obama administration officials have warned that failure to strike an immunity deal with Afghanistan would also result in a pullout, but Afghan President Hamid Karzai and U.S. officials have expressed confidence a deal can be reached.

Republicans, who have criticized Obama's drawdown strategy in Afghanistan, noted that the president would have left a much smaller force in Iraq than Austin recommended, even if a deal had been struck.

Senator John McCain of Arizona lamented the lack of a U.S. presence in Iraq.

Pressed by Republicans, Austin acknowledged that the situation in Iraq was trending in a "problematic" direction, and agreed that a continued U.S. role would have helped bolster Iraqi forces.

When it came to Afghanistan, Senator Lindsay Graham of South Carolina warned Austin that if Obama sought an insufficient force for the post-2014 mission, he would refuse to vote for funding the war effort.

"It can be as low as 9 or 10,000, that I will stand with them," Graham said.

"If they overrule the commanders and create a force that cannot in my view be successful, I cannot in good conscience vote to continue this operation."

Graham said he would vote for Austin's confirmation once Austin spoke with the former commander of the Afghan mission, General John Allen, about his recommendations to Obama and reported back to the committee about his opinion.

(Reporting by Phil Stewart; Editing by David Brunnstrom)

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Justin Timberlake’s ‘Suit & Tie’ Video Is Just as Justin Timberlake-y as Expected

At the Grammys he made our screens go sepia tone, and now, in his new, black-and-white, David Fincher-directed music video for the much hyped comeback single “Suit & Tie,” Justin Timberlake continues to try and prove that he’s a classy neo-Rat Pack star. That is, he’s a classy neo-Rat Pack star with a nearly naked women writhing around him and lot of “cool” modern conveniences like his iPad. See, JT gets rolled, via bed, into a soundstage-type area reading such a device: 

RELATED: David Fincher Is Directing the Ridiculous Justin Timberlake Music Video

Before he starts performing the song at a venue that appears to be Los Angeles’ Hollywood Bowl, JT and Jay-Z are just kind of chilling, because remember these are two improbably famous bros with a lot of fancy amenities: 

RELATED: The 2012 Gossip Stories We Loved

There are references to Singin’ in the Rain-type films: 

RELATED: Dr. Dre and the Lucrative Business of Not Rapping

And then, later on, hot girls in puddles on a stage because such is the life of Justin Timberlake, apparently: 

Watch the entire video here, and remember it was directed by Fincher, so they all probably did a million takes of every shot: 

Gadgets News Headlines – Yahoo! News

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Why Melissa Joan Hart Is Resisting Valentine's Day This Year

Age is more than just a number for mom-of-three Melissa Joan Hart.

The actress, who welcomed her second child, Brady, now 4½, two years after the birth of her first son, Mason, now 7, says waiting until both boys were older to expand her family further was ideal.

“It’s definitely easier to have an infant when the other two boys are potty trained and can dress themselves,” Hart, 36, told PEOPLE at Wednesday’s Operation Shower in Pacific Palisades, Calif.

“I’m able to enjoy every single minute, and that has been great.”

Basking in baby bliss with her now 5-month-old son Tucker, Hart is embracing the opportunity to relive all of the major milestones for a third time.

“[Tucker] is just such a happy baby, lots of smiles and laughing. Like the other boys, he has great motor skills and right now it’s fun to see him grab at things,” she says.

Eddie Spantman

Unlike his older brothers, however, Tucker is already sporting some long locks. “One of the biggest differences is that he has tons of hair,” she says.

Having welcomed three children, Hart is adamant about celebrating every birth, which is why she has teamed up with Operation Shower and Birdies for the Brave, a mission to host baby showers for military families whose partners are serving overseas.

“I can’t even imagine how difficult it is for these military moms going through pregnancy alone while their spouses are in harm’s way. It’s an emotional time, especially with all of the hormones,” she says of the event, hosted by Carousel Designs.

“Operation Shower and Birdies for the Brave do a great job of making these moms feel special and recognizing all of their sacrifices at home. It’s a sincere pleasure to support these two outstanding organizations.”

With Valentine’s Day on Thursday, Hart and her husband Mark Wilkerson are looking forward to toasting to some couple time — only she’ll be phoning it in from the set of her show, Melissa & Joey.

“Valentine’s Day is my first day back at work, so I will be enjoying the day with the great cast and crew,” she says.

Continues Hart: “We usually celebrate the day before or the day after anyhow since it’s difficult getting a babysitter that night and it’s so crowded everywhere.”

– Anya Leon

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Pope shows lifetime jobs aren't always for life

The world seems surprised that an 85-year-old globe-trotting pope who just started tweeting wants to resign, but should it be? Maybe what should be surprising is that more leaders his age do not, considering the toll aging takes on bodies and minds amid a culture of constant communication and change.

There may be more behind the story of why Pope Benedict XVI decided to leave a job normally held for life. But the pontiff made it about age. He said the job called for "both strength of mind and body" and said his was deteriorating. He spoke of "today's world, subject to so many rapid changes," implying a difficulty keeping up despite his recent debut on Twitter.

"This seemed to me a very brave, courageous decision," especially because older people often don't recognize their own decline, said Dr. Seth Landefeld, an expert on aging and chairman of medicine at the University of Alabama at Birmingham.

Age has driven many leaders from jobs that used to be for life — Supreme Court justices, monarchs and other heads of state. As lifetimes expand, the woes of old age are catching up with more in seats of power. Some are choosing to step down rather than suffer long declines and disabilities as the pope's last predecessor did.

Since 1955, only one U.S. Supreme Court justice — Chief Justice William Rehnquist — has died in office. Twenty-one others chose to retire, the most recent being John Paul Stevens, who stepped down in 2010 at age 90.

When Thurgood Marshall stepped down in 1991 at the age of 82, citing health reasons, the Supreme Court justice's answer was blunt: "What's wrong with me? I'm old. I'm getting old and falling apart."

One in 5 U.S. senators is 70 or older, and some have retired rather than seek new terms, such as Hawaii's Daniel Akaka, who left office in January at age 88.

The Netherlands' Queen Beatrix, who just turned 75, recently said she will pass the crown to a son and put the country "in the hands of a new generation."

In Germany, where the pope was born, Chancellor Angela Merkel, who is 58, said the pope's decision that he was no longer fit for the job "earns my very highest respect."

"In our time of ever-lengthening life, many people will be able to understand how the pope as well has to deal with the burdens of aging," she told reporters in Berlin.

Experts on aging agreed.

"People's mental capacities in their 80s and 90s aren't what they were in their 40s and 50s. Their short-term memory is often not as good, their ability to think quickly on their feet, to execute decisions is often not as good," Landefeld said. Change is tougher to handle with age, and leaders like popes and presidents face "extraordinary demands that would tax anybody's physical and mental stamina."

Dr. Barbara Messinger-Rapport, geriatrics chief at the Cleveland Clinic, noted that half of people 85 and older in developed countries have some dementia, usually Alzheimer's. Even without such a disease, "it takes longer to make decisions, it takes longer to learn new things," she said.

But that's far from universal, said Dr. Thomas Perls, an expert on aging at Boston University and director of the New England Centenarians Study.

"Usually a man who is entirely healthy in his early 80s has demonstrated his survival prowess" and can live much longer, he said. People of privilege have better odds because they have access to good food and health care, and tend to lead clean lives.

"Even in the 1500s and 1600s there were popes in their 80s. It's remarkable. That would be today's centenarians," Perls said.

Arizona Sen. John McCain turned 71 while running for president in 2007. Had he won, he would have been the oldest person elected to a first term as president. Ronald Reagan was days away from turning 70 when he started his first term as president in 1981; he won re-election in 1984. Vice President Joe Biden just turned 70.

In the U.S. Senate, where seniority is rewarded and revered, South Carolina's Strom Thurmond didn't retire until age 100 in 2002. Sen. Robert Byrd of West Virginia was the longest-serving senator when he died in office at 92 in 2010.

Now the oldest U.S. senator is 89-year-old Frank Lautenberg of New Jersey. The oldest congressman is Ralph Hall of Texas who turns 90 in May.

The legendary Alan Greenspan was about to turn 80 when he retired as chairman of the Federal Reserve in 2006; he still works as a consultant.

Elsewhere around the world, Cuba's Fidel Castro — one of the world's longest serving heads of state — stepped down in 2006 at age 79 due to an intestinal illness that nearly killed him, handing power to his younger brother Raul. But the island is an example of aged leaders pushing on well into their dotage. Raul Castro now is 81 and his two top lieutenants are also octogenarians. Later this month, he is expected to be named to a new, five-year term as president.

Other leaders who are still working:

—England's Queen Elizabeth, 86.

—Abdullah bin Abd al-Aziz al-Saud, king of Saudi Arabia, 88.

—Sabah al-Ahmad al-Jaber al-Sabah, emir of Kuwait, 83.

—Ruth Bader Ginsburg, U.S. Supreme Court associate justice, 79.

__

Associated Press writers Paul Haven in Havana, Cuba; David Rising in Berlin; Seth Borenstein, Mark Sherman and Matt Yancey in Washington, and researcher Judy Ausuebel in New York contributed to this report.

___

Marilynn Marchione can be followed at http://twitter.com/MMarchioneAP

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