Many long-term studies of well-being show that people actually get happier as they age. (This lends credence, Setiya suggests, to Aristotle’s view that we grow into a “prime of life,” with the body achieving its fullest development at thirty-five and the mind at forty-nine.) Other studies show that there is a “U-shaped curve” to life satisfaction, such that we’re happiest when we’re young and old and unhappiest in between. (There are even studies of great apes, conducted by zoologists, which show that they get sad in middle age.) “Shit happens in midlife,” Setiya writes, “with kids and parents, work and health.” He is drawn to the work of the German economist Hannes Schwandt, which shows that “younger people tend to overestimate how satisfied they will be, while midlifers underestimate old age.” According to this theory, we could avoid midlife crises by calibrating our expectations.

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