Wisdom peaks around age 39. Past that we just pretend that memories older than the youngest adult generation count as wisdom. "Wise" ideas are either actually wise, or 21+ years old.
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Nobody seems to have noticed this because of 2 reasons:
a) median lifespan once used to be ~40, and 40 was also the typical age of becoming a grandparent
b) self-congratulatory gerontocracy
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Post 40 you do get more cunning about hacks that work well in your own personal life, but they get progressively less useful to anybody else. All broadly applicable life lessons that you might be able to put into a self-improvement book you'll probably discover by 40.
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Seneca, Leibniz, Darwin, etc are among a Borges legion of over 40 year olds filling an infinite library.
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I definitely feel a loss of mental plasticity at this point in my life. I worry less and less about being able to figure things out and more and about getting by with what I’ve already figured out.
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