Studies conducted in many different countries have found that several measures of human well-being are high in youth, lowest in midlife, and rise again in old age, but the reasons behind this pattern are unclear. Alexander Weiss et al. (pp. 19949-19952) studied 336 chimpanzees and 172 orangutans and found that these apes experienced a nadir in well-being during midlife similar to that previously reported in humans.
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