Question for those who play with aging off??

I play with aging off when I'm trying to accomplish something and don't want to stress about a time limit. (Aka "Better get that potty training done if you wanna be a top-notch toddler. Hurry up! You're going to be a child in twelve hours!") Otherwise I tend to leave it on, though the speed varies depending on how much time I want to spend with the family.

Any Sim I can't bear to part with just becomes a vampire. I also have ghosts as active household members when I thought I could part with the Sim in question and then turned out I couldn't.