Dennis Weaver was 27 in Horizons West when he played the character 'Dandy Taylor'.
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 2006 he died aged 81, starring in 55 films in his career, 54 of those after Horizons West was first released. If he were alive today he would be 99.
In Horizons West, I think Dennis Weaver looks: