Xavier graduating in 1962: 24 years old or 30 years old?
That's the big problem now.
According to Mangold (LOGAN), the FIRST CLASS credits were right and he was 24 years old when he graduated. This means the "1944" timestamp when he was 12 was wrong, because that scene was set in 1950.
According to many others, he was born in 1932, so the "1944" timestamp was right and he was 30 when he graduated and experienced the FIRST CLASS events in 1962. But does it make sense? I mean, he's supposed to be a genius. 30 years old?
I don't remember if in DOFP there's some reference to his age, but I think he's supposed to be 40 in 1973...? Not younger, I guess. Your feedback, please.
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The X-Men timeline was altered 2 times, not just one (DOFP).
FIRST CLASS was already a "divergence".
Everything is explained here:
THE X-MEN CINEMATIC TIMELINES
http://x-continuity.blogspot.com