O.J. Simpson was 25 in O.J. Simpson: Juice on the Loose when he played the character 'Himself'.
That was over 50 years ago in 1974.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 76, and has starred in 38 movies in total, 36 of those since O.J. Simpson: Juice on the Loose was released.
In O.J. Simpson: Juice on the Loose, I think O.J. Simpson looks: