Cary Elwes was 15 in Yesterday's Hero when he played the character 'Disco Dancer'.
That was over 44 years ago in 1979.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 60, and has starred in 109 movies in total, 101 of those since Yesterday's Hero was released.
In Yesterday's Hero, I think Cary Elwes looks: