The Clinton Herald, Clinton, Iowa

AP story section

November 19, 2012

Even apes have 'midlife crises,' study finds

NEW YORK — Chimpanzees in a midlife crisis? It sounds like a setup for a joke.

But there it is, in the title of a report published Monday in a scientific journal: "Evidence for a midlife crisis in great apes."

So what do these apes do? Buy red Ferraris? Leave their mates for some cute young bonobos?

Uh, no.

"I believe no ape has ever purchased a sports car," said Andrew Oswald, an author of the study. But researchers report that captive chimps and orangutans do show the same low ebb in emotional well-being at midlife that some studies find in people.

That suggests the human tendency toward midlife discontent may have been passed on through evolution, rather than resulting just from the hassles of modern life, said Oswald, a professor of economics at the University of Warwick in England who presented his work Monday in the Proceedings of the National Academy of Sciences.

A second study in the journal looks at a younger age group and finds that happiness in youth can lead to higher income a few years down the road.

More on that later. Let's get back to those apes.

Several studies have concluded that happiness in human adults tends to follow a certain course between ages 20 and 70: It starts high and declines over the years to reach a low point in the late 40s, then turns around and rises to another peak at 70. On a graph, that's a U-shaped pattern. Some researchers question whether that trend is real, but to Oswald the mystery is what causes it.

"This is one of the great patterns of human life. We're all going to slide along this U for good or ill," he said. "So what explains it?"

When he learned that others had been measuring well-being in apes, "it just seemed worth pursuing the hunch that the U might be more general than in humans," he said.

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