William Holden was 55 in The Towering Inferno when he played the character 'Jim Duncan'.
That was over 49 years ago in 1974.
In 1981 he died aged 63, starring in 85 films in his career, 19 of those after The Towering Inferno was first released. If he were alive today he would be 106.
In The Towering Inferno, I think William Holden looks: