Patrick Dempsey was 18 in Heaven Help Us when he played the character 'Corbet'.
That was over 39 years ago in 1985.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 58, and has starred in 53 movies in total, 51 of those since Heaven Help Us was released.
In Heaven Help Us, I think Patrick Dempsey looks: