That was over 36 years ago in 1985.
Today he is 62, and has starred in 60 movies in total, 57 since Witness was released.
In Witness, I think Viggo Mortensen looks:
Witness scores 7 out of 10 on The Movie Database.
Viggo Mortensen's first acting role was as 'Moses Hochleitner' in Witness, released in 1985 when he was 26.