Viggo Mortensen was 25 in Witness when he played the character 'Moses Hochleitner'.
That was over 39 years ago in 1985.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 65, and has starred in 72 movies in total, 67 of those since Witness was released.
In Witness, I think Viggo Mortensen looks: