That was over 43 years ago in 1978.
Today he is 91, and has starred in 91 movies in total, 60 since Superman was released.
In Superman, I think Gene Hackman looks:
Superman scores 6.9 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.