comic book temporal mechanics

I've noticed that time passes very slowly -- and unusually -- in the Marvel Universe.

Kitty Pryde jumped from 16 to 18 without a single birthday when they launched "Excalibur" back in the late 1980s. It's possible she's reverted to 16 since then; Franklin Richards and Illyana Rasputin have aged backward as well.

(Magneto too. I didn't read that story arc, but wasn't his age reversal caused by an alien or something? If memory serves, Erich was alive at the time of WWII in Marvel continuity and by the time X-men started in the 1960s, he was using mechanical apparatus to boost his fading powers. Being aged backward to youth and then working through young adulthood led to something of a rehabilitation that led to his becoming headmaster of Xavier's School for Gifted Youngers for a while, back around the time of Secret Wars II in the mid-1980s. )

And isn't it odd that Frankling remains 4 or 5 years old even after 40 years, while Harry Osborne's son has grown from infancy to 6 or 7 years old in just the past 20 years?

I'm figuring it's only a matter of time until Reed Richards or one of the other supergeniuses of the Marvel Universe realizes the time disparities and deduces that they are fictional characters.