Michael Keaton was 25 in A Different Approach when he played an uncredited character.
That was over 46 years ago in 1978.
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 80 movies in total, 76 of those since A Different Approach was released.
In A Different Approach, I think Michael Keaton looks: