Charlton Heston was 70 in In the Mouth of Madness when he played the character 'Jackson Harglow'.
That was over 29 years ago in 1995.
In 2008 he died aged 84, starring in 155 films in his career, 54 of those after In the Mouth of Madness was first released. If he were alive today he would be 100.
In In the Mouth of Madness, I think Charlton Heston looks: