Roddy McDowall was 33 in The Longest Day when he played the character 'Pvt. Morris'.
That was over 62 years ago in 1962.
In 1998 he died aged 70, starring in 166 films in his career, 129 of those after The Longest Day was first released. If he were alive today he would be 95.
In The Longest Day, I think Roddy McDowall looks: