Patton Oswalt was 26 in Down Periscope when he played the character 'Stingray Radioman'.
That was over 28 years ago in 1996.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 55, and has starred in 119 movies in total, 117 of those since Down Periscope was released.
In Down Periscope, I think Patton Oswalt looks: