Gary Lewis was 17 in The Day the Music Died when he played an uncredited character.
That was over 47 years ago in 1977.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 65, and has starred in 64 movies in total, 62 of those since The Day the Music Died was released.
In The Day the Music Died, I think Gary Lewis looks: