Lou Ferrigno was 24 in Pumping Iron when he played the character 'Self'.
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 72, and has starred in 58 movies in total, 57 of those since Pumping Iron was released.
In Pumping Iron, I think Lou Ferrigno looks: