Crispin Glover was 15 in The Best of Times when he played the character 'Crispin'.
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 60, and has starred in 61 movies in total, 60 of those since The Best of Times was released.
In The Best of Times, I think Crispin Glover looks: