The Mid-Life Crisis Strikes Apes, Too
From Nature: A study of 508 great apes in captivity shows that the animals’ sense of well-being bottoms out in their late 20s to mid-30s, the ape equivalent of middle age, before rebounding in old age. The find
From Nature: A study of 508 great apes in captivity shows that the animals’ sense of well-being bottoms out in their late 20s to mid-30s, the ape equivalent of middle age, before rebounding in old age. The finding that mid-life crises may not be uniquely human suggests that the events might have a biological, rather than a sociological, cause.
Men and women worldwide, regardless of their wealth or status, experience a dip in happiness at middle-age. Social scientists have struggled to identify the underlying cause of the dissatisfaction. Social and economic factors, such as financial hardship and the failure to realize unrealistic ambitions, are possible causes.
Alexander Weiss, a psychologist at the University of Edinburgh, UK, and his team set out to see if there might be a biological factor involved in the crises. They sought to assess the well-being of captive chimpanzees and orangutans as judged by their keepers or those who knew them well.
The apes covered all age ranges, and their ‘happiness’ was rated through a survey answered by their keepers. The survey covered four criteria: the animals’ overall mood; how much pleasure they got out of socializing; their success in achieving goals such as obtaining food and objects they desire; and how happy the keeper would be if he or she were that animal for a week.
Among three different groups of chimps and orangutans surveyed, the happiest tended to be the oldest and youngest, and the most dissatisfied tended to be in their 30s. The study, however, is a snapshot — it didn’t follow any of the apes over time — which means there could be confounding factors such as the early death of unhappy apes.
“Maybe evolution needed us to be at our most dissatisfied in midlife,” says co-author Andrew Oswald, who is based at the University of Warwick, UK. Unhappiness can be a catalyst for change, potentially spurring unhappy adults to act more adaptively, for instance, by seeking out mates.
“I don’t think you’ll find chimpanzees buying bright red shiny cars,” Weiss says. So darn, maybe that red convertible Lexus I bought in 2010 is my mid-life crisis after all. I do recall beating my chest proudly before driving off the lot with it!
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