Michael Gambon was 62 in Harry Potter and the Prisoner of Azkaban when he played the character 'Albus Dumbledore'.
That was over 20 years ago in 2004.
Today he is 83, and has starred in 112 movies in total, 48 of those since Harry Potter and the Prisoner of Azkaban was released.
In Harry Potter and the Prisoner of Azkaban, I think Michael Gambon looks: