Crispin Glover was 24 in Back to the Future Part II when he played the character 'George McFly (archive footage) (uncredited)'.
That was over 34 years ago in 1989.
Today he is 60, and has starred in 61 movies in total, 47 of those since Back to the Future Part II was released.
In Back to the Future Part II, I think Crispin Glover looks: