Simon Helberg was 17 in Mumford when he played the character 'College Roommate'.
That was over 25 years ago in 1999.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 43, and has starred in 28 movies in total, 28 of those since Mumford was released.
In Mumford, I think Simon Helberg looks: