Charlton Heston was 76 in Planet of the Apes when he played the character 'Zaius'.
That was over 23 years ago in 2001.
In 2008 he died aged 84, starring in 155 films in his career, 28 of those after Planet of the Apes was first released. If he were alive today he would be 100.
In Planet of the Apes, I think Charlton Heston looks: