Michael J. Fox was 27 in Back to the Future Part II when he played the character 'Marty McFly / Marty McFly Jr. / Marlene McFly'.
That was over 35 years ago in 1989.
Today he is 62, and has starred in 69 movies in total, 50 of those since Back to the Future Part II was released.
In Back to the Future Part II, I think Michael J. Fox looks: