Jason Segel was 17 in Can't Hardly Wait when he played the character 'Matt'.
That was over 26 years ago in 1998.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 44, and has starred in 33 movies in total, 32 of those since Can't Hardly Wait was released.
In Can't Hardly Wait, I think Jason Segel looks: