10 Oldest Mutants In X-Men History
9. Magneto (Estimated Age - 60-70)
So yeah, that Erik Magnus Lehnsherr guy. Or Max Eisenhardt. Or whatever his actual name is.
The origin story of Magneto is pretty well known at this point, owing to the powerful flashback scene that opened the first X-Men film and the current solo series that explores the character's tragic past: a young Jewish boy at the outbreak of World War II, Max was sent to the Nazi concentration camps where his parents were killed and his latent mutant abilities - he can control metal, if his name wasn't a dead giveaway - manifested themselves. After escaping Auschwitz he faced persecution elsewhere across Europe before finally decamping to Israel, where he hooked up with Charles Xavier to stop Baron Von Strucker from resurrecting Hydra.
Taking into account the sliding timeline and the relative age of his old mucker Professor X, Erick/Max/Magnus/Eric The Red/Magneto must be pushing seventy by now, at the very least. And if he was a kid during the holocaust he's probably more like eighty, which would explain the white hair which has had time to grow into long, flowing locks, and the fact that he's the sort of crotchety old git you try and avoid talking to at bus stops. Except he could mold the shelter into a trap to ensnare you so you have no choice but to listen to his ramblings about homo superior and why humans suck.
So we put Xavier somewhere in his seventies, technically, and Magneto in his eighties. Both have obviously been beneficiaries of the sliding timeline, but also from having their bodies "renewed" a handful of times. Xavier has died and been brought back to life one more than one occasion, and he himself was responsible for somehow turning Magneto back into a baby, before letting him grow up again.
So: both old as balls, just in deceptively young bodies.