Jack Nicholson was 20 in The Cry Baby Killer when he played the character 'Jimmy Wallace'.
That was over 66 years ago in 1958.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 87, and has starred in 97 movies in total, 96 of those since The Cry Baby Killer was released.
In The Cry Baby Killer, I think Jack Nicholson looks: