Michael McKean was 64 in Batman: The Dark Knight Returns, Part 2 when he played the character 'Bartholomew Wolper (voice)'.
That was over 11 years ago in 2013.
Today he is 76, and has starred in 102 movies in total, 16 of those since Batman: The Dark Knight Returns, Part 2 was released.
In Batman: The Dark Knight Returns, Part 2, I think Michael McKean looks: