Terence Stamp was 23 in Term of Trial when he played the character 'Mitchell'.
That was over 62 years ago in 1962.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 85, and has starred in 94 movies in total, 92 of those since Term of Trial was released.
In Term of Trial, I think Terence Stamp looks: