That was over 49 years ago in 1973.
Today he is 78, and has starred in 76 movies in total, 74 since Lemmings was released.
In Lemmings, I think Chevy Chase looks:
Lemmings scores 4 out of 10 on The Movie Database.
Chevy Chase's first acting role was as 'Various' in Lemmings, released in 1973 when he was 29.