Gregory Peck was 45 in To Kill a Mockingbird when he played the character 'Atticus Finch'.
That was over 61 years ago in 1962.
In 2003 he died aged 87, starring in 94 films in his career, 53 of those after To Kill a Mockingbird was first released. If he were alive today he would be 108.
In To Kill a Mockingbird, I think Gregory Peck looks: