That was over 18 years ago in 2003.
Today he is 51, and has starred in 85 movies in total, 50 since School of Rock was released.
In School of Rock, I think Jack Black looks:
School of Rock scores 6.8 out of 10 on The Movie Database.
Jack Black's first acting role was as 'Roger Davis' in Bob Roberts, released in 1992 when he was 23.