That was over 39 years ago in 1982.
Today he is 82, and has starred in 109 movies in total, 93 since First Blood was released.
In First Blood, I think Brian Dennehy looks:
First Blood scores 7.2 out of 10 on The Movie Database.
Brian Dennehy's first acting role was as 'Surgeon' in Looking for Mr. Goodbar, released in 1977 when he was 39.