That was over 48 years ago in 1974.
Today he is 80, and has starred in 67 movies in total, 66 since Petersen was released.
In Petersen, I think Jack Thompson looks:
Petersen scores 7 out of 10 on The Movie Database.
Jack Thompson's first acting role was as 'Tony Petersen' in Petersen, released in 1974 when he was 33.