As part of the new Secret Wars reality fracture crossover, the X-Men get old. Cyclops’s optic blasts go the way of everyone’s eyesight. Wolverine trends towards Old Man Logan (another alternate take getting another airing). Comic Book Aging is a common complaint, so seeing it done away with is always interesting.
This goes to other fantastic styles as well - Conan was still beheading people in his seventies, following Beowulf’s example, as commented on by Cohen in Discworld. James Bond has regenerated almost as often as the Doctor. And vampire stories are at least partially about the desire to never grow old.