… our immune system evolved to hum along at peak capacity when we’re happy but to slow down dramatically when we’re not. This is why long-term unhappiness can literally kill you through its immune-suppressing effects, and why loneliness in late adulthood is deadlier than smoking. Indeed, once you’re over sixty-five you’re better off smoking, drinking, or overating with your friends than you are sitting at home alone.
With this background in mind, Trivers hypothesized that older adults evolved a strategy of turning this relationship on its head, becoming more focused on the positive things in life in an effort to enhance their immune functioning. Such a strategy would be more sensible for older than younger adults for two reasons. First, older adults have a weaker immune system than younger adults, and face greater threats from tumors and pathogens. Second, older adults know much more about the world than younger adults do, so they don’t need to pay as much attention to what’s going on around them. For example, when older adults interact with a surly bank employee or a harried flight attendant, they have a library of related experiences to draw upon and can respond to the situation effectively without giving it much thought. As a result, they can afford to gloss over some of the unpleasant things in life.
William von Hippel, The Social Leap: The New Evolutionary Science of Who We Are, Where We Come From, and What Makes Us Happy, 2018.
August 24, 2021
QotD: Happiness and aging
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