Harvey Korman was 53 in History of the World: Part I when he played the character 'Count de Monet'.
That was over 43 years ago in 1981.
In 2008 he died aged 81, starring in 55 films in his career, 28 of those after History of the World: Part I was first released. If he were alive today he would be 97.
In History of the World: Part I, I think Harvey Korman looks: