You're only as young as the last time you changed your mind.

Timothy Francis Leary (1920 CE-1996 CE), Timothy Francis Leary was an American psychologist and writer known for his strong advocacy of psychedelic drugs. Evaluations of Leary are polarized, ranging from bold oracle to publicity hound. He was "a hero of American consciousness", according to Allen Ginsberg, and Tom Robbins called him a "brave neuronaut".