@Redletter: Ok so here is why. During a fight againt the Defenders (issue 15 and 16 of the original series) Magneto made a new mutant-like entity named Alpha the Ultimate Mutant. This mutant was made by Magneto to help further his cause, but the creature turned on it's maker and returned Magneto to the age of an infant. Magneto was then taken care of by Moria McTaggert for some months before he was restored to his prime age as a young man. This change also started his reform period, in witch he joined the X-men in the 1980's.
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