1920 - 1996
Timothy Leary was an American psychologist and writer, best known for his advocacy of psychedelic drugs and the exploration of consciousness. He gained prominence in the 1960s as a leader in the counterculture movement, popularizing the slogan "Turn on, tune in, drop out." Leary's work and ideas significantly influenced the fields of psychology, philosophy, and culture during that era.
You're only as young as the last time you changed your mind.