Thomas F. Wilson was 30 in Back to the Future Part III when he played the character 'Buford "Mad Dog" Tannen / Biff Tannen'.
That was over 34 years ago in 1990.
Today he is 65, and has starred in 34 movies in total, 29 of those since Back to the Future Part III was released.
In Back to the Future Part III, I think Thomas F. Wilson looks: