Truly hairy mid-life crises: chimps and orangs get them too

NEW YORK, Nov 19 (Reuters) - Forty- and 50-somethings in the

throes of a mid-life crisis should probably stop blaming a

troubled marriage, their kid's college costs, or technology that

makes them feel about as modern as papyrus compared to their

younger colleagues.

A new study finds that chimpanzees and orangutans, too,

often experience a mid-life crisis, suggesting the causes are

inherent in primate biology and not specific to human society.

"We were just stunned" when data on the apes showed a

U-shaped curve of happiness, said economist Andrew Oswald of the

University of Warwick in England and a co-author of the paper,

which was published on Monday in the Proceedings of the National

Academy of Sciences of the USA.

The U-shaped curve of human happiness and other aspects of

well-being are as thoroughly documented as the reasons for it

are controversial. Since 2002 studies in some 50 countries have

found that well-being is high in youth, plunges in mid-life and

rises in old age. The euphoria of youth comes from unlimited

hopes and good health, while the contentment and serenity of the

elderly likely reflects "accumulated wisdom and the fact that

when you've seen friends and family die, you value what you

have," said Oswald.

The reasons for the plunge in well-being in middle age, when

suicides and use of anti-depressants both peak, are murkier. In

recent years researchers have emphasized sociological and

economic factors, from the accountant's recognition that she

will never realize her dream of starring on Broadway to the

middle manager's fear of being downsized, not to mention failing

marriages and financial woes.

In what Oswald, 58, calls "a burst of madness," since no

such study had ever been attempted, he and his colleagues

decided to see whether creatures that don't have career regrets

or underwater mortgages might nevertheless suffer a well-being

plunge in middle age.

They enlisted colleagues to assess the well-being of 155

chimps in Japanese zoos, 181 in U.S. and Australian zoos and 172

orangs in zoos in the United States, Canada, Australia and

Singapore. Keepers, volunteers, researchers and caretakers who

knew the apes well used a four-item questionnaire to assess the

level of contentment in the animals, said psychologist Alex

Weiss of Scotland's University of Edinburgh. One question, for

instance, asked how much pleasure the animals - which ranged

from infants to graybeards - get from social interactions.

All three groups of apes experienced mid-life malaise: a

U-shaped contentment curve with the nadir at ages 28, 27 and 35,

respectively, comparable to human ages of 45 to 50.

Why would chimps and orangs have a mid-life crisis? It could

be that their societies are similar enough to the human variety

that social, and not only biological, factors are at work,

Oswald said. Perhaps apes feel existential despair, too, when

they realize they'll never be the alpha male or female.

An evolutionary explanation is even more intriguing. "Maybe

nature doesn't want us to be contented in middle age, doesn't

want us sitting around contentedly with our feet up in a tree,"

he said. "Maybe discontent lights a fire under people, causing

them to achieve more" for themselves and their family.

"By knowing our results, people might be gentler on

themselves" when they experience a mid-life crisis, Oswald said.

"Knowing that it's biological, they'll realize that if they can

just hang on they'll likely come out the other side."

(Editing by James Dalgleish)

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