That was over 40 years ago in 1981.
Today he is 91, and has starred in 91 movies in total, 57 since Superman II was released.
In Superman II, I think Gene Hackman looks:
Superman II scores 6.5 out of 10 on The Movie Database.
Gene Hackman's first acting role was as 'Norman' in Lilith, released in 1964 when he was 34.