Henry Winkler was 27 in Nightmare when he played the character 'Auditioning Actor (uncredited)'.
That was over 50 years ago in 1974.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 78, and has starred in 75 movies in total, 74 of those since Nightmare was released.
In Nightmare, I think Henry Winkler looks: