Aliens aging
So seeing that there's always someone with an answer, I'd like to see if anyone is able to rationalize this: how did Michael or Christina (that was her name right? the First Lady) manage to go unnoticed to their children and spouses? I'm sure I'd notice if my wife didn't age in a decade. Hell, I see pictures of me 5 years ago and I want to cry.
Suspension of disbelief is an accepted answer.
"That was a courtesy flush. I'm not actually done yet"