Marlon Wayans was 15 in Robert Townsend: Partners in Crime: Vol. 2 when he played an uncredited character.
That was over 36 years ago in 1988.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 51, and has starred in 42 movies in total, 38 of those since Robert Townsend: Partners in Crime: Vol. 2 was released.
In Robert Townsend: Partners in Crime: Vol. 2, I think Marlon Wayans looks: