Peter MacNicol was 26 in Dragonslayer when he played the character 'Galen'.
That was over 43 years ago in 1981.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 70, and has starred in 35 movies in total, 33 of those since Dragonslayer was released.
In Dragonslayer, I think Peter MacNicol looks: