Cary Grant was 50 in To Catch a Thief when he played the character 'John Robie'.
That was over 68 years ago in 1955.
In 1986 he died aged 82, starring in 133 films in his career, 59 of those after To Catch a Thief was first released. If he were alive today he would be 119.
In To Catch a Thief, I think Cary Grant looks: