Richard Lewis was 30 in Diary of a Young Comic when he played the character 'Billy Goldstein / Gondola'.
That was over 45 years ago in 1979.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 76, and has starred in 39 movies in total, 38 of those since Diary of a Young Comic was released.
In Diary of a Young Comic, I think Richard Lewis looks: