Arg. I checked the alterations I made. I made the zombie check have the same true result as the false result. Nothing happens. No errors, no aging for zombies, but other sims still age normally. It's still like it's not even being read by the game. No hack conflicts were found. This is absolutely frustrating. I have no idea why this wouldn't work.
I'm going to look around the whole thing instead of just in this BHAV. I don't know if OFB has those two BHAVs you mentioned, but I'll look for those first.
Oh, and for those interested, I don't give my computer Viagra. I give it Cialis.