In the Harry Potter movies, Ron, Harry and Hermione joke about how old Dumbledore is, but end up laughing. I wondered how old he was, since he 'invited' tom riddle to Hogwarts....etc.
The page said:
Albus Dumbledore: 1881 - 1996 ...
... meaning he was 115 when he died as per JKR's latest official data (as opposed to 150 as previously speculated).
But, as @slytherincess noted in previous answer, JKR is notoriously bad at math so take it with a huge grain of salt.