Amazing X-Men People keep wondering how these heroes can still be going after decades of stories about them. Here's a simple solution that isn't the "it's just comics" one: they aren't strictly "human" anymore. Their physiologies are so frequently improved, altered, upgraded and/or fucked with, that there's no WAY they experience cellular degeneration the same way we do. At some point you've bent the human form too far, and either you fall apart altogether (not happening here clearly) or you "fix" whatever it is that makes us age in the first place.