This is what JK said on the subject, in an interview back in 2000:
"Question: How old is old in the wizarding world, and how old are Professors Dumbledore and McGonagall?
J.K.: Dumbledore is a hundred and fifty, and Professor McGonagall is a sprightly seventy. Wizards have a much longer life expectancy than Muggles. (Harry hasn't found out about that yet.)" |