That was over 48 years ago in 1974.
Today he is 91, and has starred in 91 movies in total, 69 since The Conversation was released.
In The Conversation, I think Gene Hackman looks:
The Conversation scores 7.5 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.