Help me solve this mystery.....

"Cupid;c-16806423" wrote:
There are certain hidden NPC traits that can make a sim immortal. Moving them in or playing with them would then remove those traits, allowing them to age again.

It has to be something like that, but I'm not seeing what it is.

"EricasFreePlay;c-16806427" wrote:
I just checked the Detective profession on Sims Wiki and it did not mention a Sim becoming immortal at all. She may have had the three kids from another marriage/relationship before she met your Sim if she is an NPC thanks to MCCC. I haven't used it but I have heard it do some strange things in this game.

She did have the 3 kids before she met my sim. Their family tree is very.... in depth. They died of old age. The grandson is a teenager. I'm not trying to figure out where the kids came from. I'm trying to figure out how an YA, at the beginning of their YA stage, HAS three passed on, elder kids and one teen grandson (at her age and why she only started aging).

"kalaksed;c-16806430" wrote:
being a detective doesn't mark a sim for immortality, but being the criminal summoned by an apb does (it gives a hidden trait, as do the other immortality ones that aren't for vampires). when you moved her to the house as a played sim, though, she might have lost that hidden trait. but you can double check on the hidden traits list for her with showsiminfo. if it is still around and grants immortality, it'll say it does so (aging off, death off) right beneath the trait

made a list of the traits that do this in another thread, but trying to remember which it was... been a while...

editing to say:
what i do recall are 'weirdo' sims from san myshuno (the ones that like to wear bathing suits and hats or raccoon suits), the aforementioned detective criminals (they get deleted if caught on an apb, but stick around as a hidden household if you arrest the wrong sim), some food stall vendors and some service npcs have death disabled, as well as aging. there's a larger list that just has aging disabled

I wouldn't have a criminal summoned cause I haven't played the detective career in this save. I did look around Sims Info and no hidden traits are showing. I think you and Cupid are right. I think it was a hidden trait that dropped when she moved in. Maybe like busker. Aging is enabled, Death in enabled. I checked all that with Sims Info. She is - as of this moment - a 100% normal sim. So it has to be she was a busker or another trait that dropped.