John Cleese was 51 in An American Tail: Fievel Goes West when he played the character 'Cat R. Waul (voice)'.
That was over 33 years ago in 1991.
Today he is 84, and has starred in 161 movies in total, 104 of those since An American Tail: Fievel Goes West was released.
In An American Tail: Fievel Goes West, I think John Cleese looks: