Mario Van Peebles was 13 in Sweet Sweetback's Baadasssss Song when he played the character 'The Young Sweetback'.
That was over 53 years ago in 1971.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 67, and has starred in 73 movies in total, 72 of those since Sweet Sweetback's Baadasssss Song was released.
In Sweet Sweetback's Baadasssss Song, I think Mario Van Peebles looks: