User blog comment:Johnnybravo44/Additional First Class post/@comment-3034314-20110604010713/@comment-1671874-20110607035600

I believe first class is in the late 60s, early 70s? I forget the exact time. But the first X-Men was "present day" around 2000, so it's made to seem like at least 30 years had passed. Which is why they can easily make another prequel sequel...