How to Reconcile 'Xmen First Class" with "Xmen Origins: Wolverine"? #SPOILERS! #Xmen #Xavier

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(Especially since Hugh Jackman had a cameoas Wolverine when Xavier & Eric first started recruiting mutants with the CIA!) The glaring 'break' we need to reconcile: the end of -First Class- shows how Xavier lost his mobility while still relatively young, while -Wolverine- shows the bald, old Xavier walking (or at least standing) normally. What's up with that?