Moreover, what spurs editing isn’t aging per se, Carstensen found, but endings of any sort. For example, when she compared college seniors with new college students, students in their final year displayed the same kind of social-network pruning as their seventy-something grandparents. When people are about to switch jobs or move to a new city, they edit their immediate social networks because their time in that setting is ending. Even political transitions have this effect. In a study of people in Hong Kong four months before the territory’s handover from Great Britain to the People’s Republic
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