Robert Mitchum was 44 in The Longest Day when he played the character 'Brig. Gen. Norman Cota'.
That was over 62 years ago in 1962.
In 1997 he died aged 79, starring in 139 films in his career, 67 of those after The Longest Day was first released. If he were alive today he would be 106.
In The Longest Day, I think Robert Mitchum looks: