Keegan-Michael Key was 18 in Lunatics: A Love Story when he played the character 'Passerby (uncredited)'.
That was over 33 years ago in 1991.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 53, and has starred in 55 movies in total, 54 of those since Lunatics: A Love Story was released.
In Lunatics: A Love Story, I think Keegan-Michael Key looks: