Abstract
Sociality As humans age, we prioritize established positive friendships over the new, but risky, socializing we do when we are young. It has been hypothesized that this shift may come as our own sense of mortality kicks in. Rosati et al. analyzed a rare, long-term dataset on social bonds among male chimpanzees and found a very similar focus on old and positive friendships (see the Perspective by Silk). Though there is evidence of some sense of time among nonhuman animals, it seems unlikely that they have the same impending sense of mortality that we experience; thus, these results suggest that a different, and deeper, mechanism may be at play. Science , this issue p. [473][1]; see also p. [403][2] [1]: /lookup/doi/10.1126/science.aaz9129 [2]: /lookup/doi/10.1126/science.abe9110
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