That was over 36 years ago in 1985.
Today he is 78, and has starred in 93 movies in total, 61 since Witness was released.
In Witness, I think Harrison Ford looks:
Witness scores 7 out of 10 on The Movie Database.
Harrison Ford's first acting role was as 'Bellhop Pager (uncredited)' in Dead Heat on a Merry-Go-Round, released in 1966 when he was 24.