Struan Rodger was 26 in The Lonely Man's Lover when he played the character 'David'.
That was over 50 years ago in 1974.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 77, and has starred in 30 movies in total, 29 of those since The Lonely Man's Lover was released.
In The Lonely Man's Lover, I think Struan Rodger looks: