Martin Landau was 29 in Pork Chop Hill when he played the character 'Lt. Marshall'.
That was over 65 years ago in 1959.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2017 he died aged 89, starring in 127 films in his career, 126 of those after Pork Chop Hill was first released. If he were alive today he would be 95.
In Pork Chop Hill, I think Martin Landau looks: