John Astin is 84. In addition to The Addams Family, he once played the part of "The Riddler" in place of Frank Gorshin on the 1960s Batman TV show. (I'm not sure, but I think there was a salary dispute with Frank Gorshin, so John Astin was brought in to play the part.)
I always liked John Astin in a old “Night Gallery” episode where he played a hippy who died in a car wreck and went to Hell.
....he is also Patty Duke's dad.