Well, Jennifer [Lawrence] is the easiest one to rationalize because she can make herself look however she wants to make herself look," explains Kinberg. "The aging on her is Mystique should actually always be the same age when she's blue. And when she's white, she is just pretending to look young, the same way she was pretending to look like Richard Nixon."
"But for all the other characters, Michael Fassbender, James McAvoy, Nicholas Hoult, going back to First Class, they certainly have not aged 30 years since we started making those movies 10 years ago," he acknowledges. "And the way that we sort of rationalized it, and it is a rationalization for sure, was that they aged a little differently because they're mutants, and we hoped that the audience would go with that. And so far that's not been a problem for the audience."