Robert Stack was 19 in First Love when he played the character 'Ted Drake'.
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 2003 he died aged 84, starring in 69 films in his career, 67 of those after First Love was first released. If he were alive today he would be 105.
In First Love, I think Robert Stack looks: