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Yes, of course, the U-shaped curve—she’d been mentioning that a lot lately, whenever Jack prodded her in this way. It was a phenomenon well known among certain economists and behavioral psychologists, that happiness, in general, over a lifetime, tended to follow a familiar pattern: people were most happy when they were young and when they were old, and least happy in the middle. It seemed that happiness spiked around age twenty, spiked again around age sixty, but bottomed out in between, which was where Jack and Elizabeth now found themselves, at the bottom of that curve, in midlife, a period that was notable not for its well-publicized “crisis” (actually a pretty rare phenomenon—only 10 percent of people reported having one) but for its slow ebb into a quiet and often befuddling restlessness and dissatisfaction. This was, Elizabeth insisted, a universal constant: the U-shaped curve pertained to both men and women, both the married and unmarried, the rich and poor, the employed and unemployed, the educated and uneducated, the parents and the child-free, in every country, every culture, every ethnicity, for all the decades that researchers had done this work—the science showed that people in midlife were carrying around with them, all the time, a feeling that was, statistically speaking, the equivalent of someone close to them having recently died. That’s how it felt, she said, that’s how far you were from your early-twenties peak, according to objective measures of well-being. Elizabeth suspected it had something to do with biology, natural selection, evolutionary pressures millions of years ago, as it had been recently shown by primatologists that great apes also experienced the exact same happiness curve, which suggested that this particular midlife sadness must have provided some kind of prehistoric advantage, must have helped our ancient primate ancestors survive. Perhaps, Elizabeth hypothesized, it was because the most vulnerable members of any troop were the young and the old, and so it was important
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