This is where Quesada is going "And this is why Peter shouldn't grow up" since Peter aging would mean MJ would age and she wouldn't be beautfiul forever.
I mean come on, there's more to MJ than her looks you know.
Besides MJ is based on Ann Margret and here's how Ann Margret looks in her later years:
https://en.wikipedia.org/wiki/Ann-Margret
Pretty similar I think.
I mean it could be worse. Have you seen Brigitte Bardot. She was a 60s beauty goddess but now you see her and she's quite withered (she's also become a far-right wing nutcase).