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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.