Generations Bug Thread - Please see compiled list on first page before posting.

I read that there's a LTR that gives your Sims a potion that prevents aging. The only way to counter it is to throw a birthday party with the birthday cake.

What are the odds that this feature may not be programed properly right now, which is why some Sims are not aging? I mean, it's entirely possible for this feature to have gotten confused on a coding level and instead of just activating on selective Sims, it activated for ALL Sims even if they don't have the LTR.