But they aren't. There is a sliding time scale. The 05 aren't that much older than ANAD actually because when they joined they were older than when the 05 became X-Men (16-18). Also going into the 80's Rogue was 18 when she joined, and Rachel was 17, Kitty was about was 14 when she joined. Kurt and Ororo were about the same age in that era. He was 21 and she was about 22/23. I think Piotr was about 19.