Carstensen gave her hypothesis the impenetrable name “socioemotional selectivity theory.” The simpler way to say it is that perspective matters. She produced a series of experiments to test the idea. In one, she and her team studied a group of adult men ages twenty-three to sixty-six. Some of the men were healthy. But some were terminally ill with HIV/AIDS. The subjects were given a deck of cards with descriptions of people they might know, ranging in emotional closeness from family members to the author of a book they’d read, and they were asked to sort the cards according to how they would
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