Washington: Chimpanzees and orangutans can experience a mid-life crisis just like humans, a study has found.The study set out to test the theory that the pattern of human well-being over a lifespan might have evolved in the common ancestors of humans and great apes.An international team of researchers, including economist Professor Andrew Oswald from the University of Warwick and psychologist Dr Alex Weiss from the University of Edinburgh, discovered that, as in humans, chimpanzee and orangutan well-being (or happiness) follows a U shape and is high in youth, falls in middle age, and rises again into old age. The authors studied 508 great apes housed in zoos and sanctuaries in the United States, Japan, Canada, Australia and Singapore. The apes’ well-being was assessed by keepers, volunteers, researchers and caretakers who knew the apes well.Their happiness was scored with a series of measures adapted from human subjective well-being measures.
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