LL Cool J was 16 in Krush Groove when he played the character 'Himself'.
That was over 39 years ago in 1985.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 56, and has starred in 44 movies in total, 43 of those since Krush Groove was released.
In Krush Groove, I think LL Cool J looks: