Michael Rapaport was 21 in Zebrahead when he played the character 'Zack'.
That was over 32 years ago in 1992.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 54, and has starred in 76 movies in total, 75 of those since Zebrahead was released.
In Zebrahead, I think Michael Rapaport looks: