Richard Crenna was 24 in The Pride of St. Louis when he played the character 'Paul Dean'.
That was over 72 years ago in 1952.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2003 he died aged 76, starring in 93 films in his career, 91 of those after The Pride of St. Louis was first released. If he were alive today he would be 97.
In The Pride of St. Louis, I think Richard Crenna looks: