Oh I just had a nasty thought! About calendar birthdays....
I play with aging off except for household I play currently in but as they just put in the birthday dates in the calendar and as the Sims will age up on their B-DAY regardless of them STILL having day...
I thought that the birthdays on the calendar was just a yearly marker, not an actual thing that will age up a sim. How will this affect those that are not suppose to age up, like vampires?