That was over 36 years ago in 1985.
Today he is 73, and has starred in 74 movies in total, 67 since Clue was released.
In Clue, I think Michael McKean looks:
Clue scores 7.2 out of 10 on The Movie Database.
Michael McKean's first acting role was as 'David St. Hubbins' in This Is Spinal Tap, released in 1984 when he was 36.