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Middle age rule
(sh.itjust.works)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
They exclude infant morality from average lifespan. And there's limited returns. At about 60-65 a large die off starts in an age cohort. Half of them will not make it 75, and three quarters will not make it to 85. Very few make it to 100.