User blog comment:Blinkn/How old are they?/@comment-4854409-20120612213505/@comment-821254-20120613173202

I agree with your speculations, its in line with what I thought about their ages.

Because it honestly never occurred to me that Magneto might be older than Xavier, but it makes complete sense now that its been pointed out. I always assumed they were the same age, but Magneto has been de-aged at some point, hence why he seems to young, but Xavier has not so if they were the same age the Professor would have to look much older.

The Professor has the "feel" of and elder, with wizened body. His vigor hides age, especially now that he can walk, again.