Jason Mewes was 19 in Clerks when he played the character 'Jay'.
That was over 30 years ago in 1994.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 49, and has starred in 82 movies in total, 80 of those since Clerks was released.
In Clerks, I think Jason Mewes looks: