That was over 36 years ago in 1985.
Today he is 57, and has starred in 55 movies in total, 45 since Back to the Future was released.
In Back to the Future, I think Crispin Glover looks:
Back to the Future scores 8.1 out of 10 on The Movie Database.
Crispin Glover's first acting role was as 'Crispin' in The Best of Times, released in 1981 when he was 16.