Peter Cushing was 25 in The Man in the Iron Mask when he played the character 'Second Officer'.
That was over 85 years ago in 1939.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 1994 he died aged 81, starring in 120 films in his career, 120 of those after The Man in the Iron Mask was first released. If he were alive today he would be 110.
In The Man in the Iron Mask, I think Peter Cushing looks: