as for the cast aging and FOX... they don't care, they are making X-force next, the cast ages mean nothing to FOX, its obvious the moment they decided to branch out into origins that they didn't care that the cast were aging, fox would bring rogue back in her 50s and they wouldn't be phased by it, i honestly tell you now no one at fox is biting their nails worrying about the cast aging
Paramount have a gold mine with the indiana jones franchise, last one made $786,636,033 in 2008, but Harrison Ford is aging and he is still aging (71), but paramount will make another given the chance, its not there job to care about that stuff its the writers and director job to make it work