[HPforGrownups] Wizard's Age

[Yis M Koslowitz]

No: HPFGUIDX 24268

Therefore, we know that witches and wizards age normally for at least 
part of there lives. Do they have random intervals of suspended aging 
after they hit,say, 20? Or do they simply age slower after they reach 
a certain age? Is it the same for each wizard/witch? Dose it depend 
on an emotional or mental stage in someone's life rather than 
physical?

I wonder if it depends on magic usage. Clearly, I am borrowing a concept
from some other series here, but maybe the working of a really powerful
bit of magic (like the Fidelius Charm) rapidly ages you. It's as though
magic is keeping you young, but when you divert a lot of it into one
major spell, you suddenly age a lot. That would explain Dumbledore's
not-yet gray beard at age 100 - that was before Voldemort's rise, and
possibly before he worked on creating the Sorcerer's Stone. 
Also, maybe he chose to go gray when he became Headmaster - it fits in
with the Headmaster image.