Peter Firth was 17 in Brother Sun, Sister Moon when he played an uncredited character.
That was over 52 years ago in 1972.
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 53 movies in total, 52 of those since Brother Sun, Sister Moon was released.
In Brother Sun, Sister Moon, I think Peter Firth looks: