Leslie Nielsen was 27 in Dark Possession when he played the character 'Dr. Roger Waring'.
That was over 70 years ago in 1954.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2010 he died aged 84, starring in 123 films in his career, 123 of those after Dark Possession was first released. If he were alive today he would be 98.
In Dark Possession, I think Leslie Nielsen looks: