Gregory Peck was 59 in The Omen when he played the character 'Robert Thorn'.
That was over 48 years ago in 1976.
In 2003 he died aged 87, starring in 94 films in his career, 35 of those after The Omen was first released. If he were alive today he would be 108.
In The Omen, I think Gregory Peck looks: