David Silverman was 43 in Monsters, Inc. when he played the character 'Additional Voices (voice) (uncredited)'.
That was over 22 years ago in 2001.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 66, and has starred in 4 movies in total, 4 of those since Monsters, Inc. was released.
In Monsters, Inc., I think David Silverman looks: