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among other metrics, age of first memory tends to be a much less noisy signal of intelligence 3 years old = ~140 5 years old = ~120 7 years old = ~100 give or take a standard deviation this is very quick heuristic, people will often tell you this on first meeting or dates
I would have been 160ish at one point then as my earliest memory confirmed by parents must have been at age 2 or earlier because it was in a different state we didn't move out of until I was 2.
