Michael Biehn was 20 in James at 15 when he played the character 'Tony'.
That was over 47 years ago in 1977.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 67, and has starred in 90 movies in total, 89 of those since James at 15 was released.
In James at 15, I think Michael Biehn looks: