That was over 47 years ago in 1974.
Today he is 84, and has starred in 75 movies in total, 48 since Chinatown was released.
In Chinatown, I think Jack Nicholson looks:
Chinatown scores 7.9 out of 10 on The Movie Database.
Jack Nicholson's first acting role was as 'Jimmy Wallace' in The Cry Baby Killer, released in 1958 when he was 21.