Cinematic mutants age a bit slower and much better than humans.![]()
That only applies to Wolverine, Sabertooth, Mystique, and Lady Deathstrike. However, that excuse shouldn't work on other mutants like Xavier or Magneto because they eventually become old men by X1 even with the timeline change. Hell, they should've looked like Patrick Stewart and Ian McKellen at this point in Apocalypse.