Ethan Suplee was 18 in Mallrats when he played the character 'Willam Black'.
That was over 29 years ago in 1995.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 47, and has starred in 53 movies in total, 49 of those since Mallrats was released.
In Mallrats, I think Ethan Suplee looks: