Josh Peck was 12 in The Newcomers when he played the character 'Slim'.
That was over 24 years ago in 2000.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 37, and has starred in 41 movies in total, 39 of those since The Newcomers was released.
In The Newcomers, I think Josh Peck looks: