Roddy McDowall was 43 in The Poseidon Adventure when he played the character 'Acres'.
That was over 51 years ago in 1972.
In 1998 he died aged 70, starring in 166 films in his career, 101 of those after The Poseidon Adventure was first released. If he were alive today he would be 95.
In The Poseidon Adventure, I think Roddy McDowall looks: