That was over 54 years ago in 1967.
Today he is 91, and has starred in 91 movies in total, 85 since Bonnie and Clyde was released.
In Bonnie and Clyde, I think Gene Hackman looks:
Bonnie and Clyde scores 7.6 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.