Michael Gambon – 80
We all know him as Albus Dumbledore, the principal of Hogwarts from the Harry Potter series, but before he got famous as the great wizard of this magical world, he was famous for his stage performances in plays like King Lear, Skylight & The Life of Galileo.
His life has seen himself doing more theatre work than TV or film combined, but this 79-year-old started having problems remembering his dialogues so he left the stage back in 2015. That does not mean, however, that he left acting altogether as we still get to watch him perform flawlessly on screen even at this age.