That was over 41 years ago in 1981.
Today he is 71, and has starred in 88 movies in total, 73 since Stripes was released.
In Stripes, I think Bill Murray looks:
Stripes scores 6.4 out of 10 on The Movie Database.
Bill Murray's first acting role was as 'Nick Kessel (uncredited)' in Next Stop, Greenwich Village, released in 1976 when he was 25.