Peaking in our sixties

These brain circuits mature at different times during development, and although there are major maturational events that take place in the terrible twos, puberty, late adolescence, the twenties, and the mid-thirties, some are not completely integrated until one is in the sixties, which appears to be the typical average peak time of human insight, cognition, and understanding in many realms of life.

James Fallon, The Psychopath Inside: A Neuroscientist's Personal Journey into the Dark Side of the Brain (New York: Current, 2013), pp. 55.