All Sims Die/age up in existing save (Patch 1.110.311/ 2.03)

As soon as I join my save file, all my sims are fully aging up even though it is not their birthday. I tried uninstalling, reinstalling, restarting the game and every time I play the save file they still are aging up. I am unsure of how to get them back to their normal state before it occurs. I will state my game is on long life span, however I changed it to normal and they were still aging up. I am unsure how to prevent this or how to revert it back to normal. I also have CC installed and got rid of any bad cc that I could, I also am playing from the Pc. Any help would be appreciated :)

HI leah1224

 for completions sake could you please add tags for mod usage (if you use any or not) and your platform. Thank you.

My sims all age up as soon as I load into the Lot and elderly sims die. This happens on Vanilla and with Mods

Platform: PC
Patch: 1.119.109.1020
BaseGame + All DLC

I mostly play with the "Long Lifespan" and "Auto-Aging: Active Family Only" settings. Auto-aging is disabled for unplayable households. After update 1.119.109.1020 in some previously unplayable households, when I decide to play as one of them, all Sims in that household automatically age or partially or completely fill the age scale, as if a game was being played for this households before. Before the update, this did not exist. 
This might not be a bug if it applied to all unplayable households, but it doesn't.

I have the same issue, discovered only today.

I have a bunch of households. I play each in their turn without any issue until this day. I'm on long lifespan and auto-aging only for active household.

But today when I changed for another household one of the sims aged up automatically. I quitted without saving, tried another one and the oldest sim died instantly. Every household I tried, a sim or plus aged up automatically. In one household every sims aged up. Only the last household I was playing lately didn't trigger the bug, I checked. But the household I was playing with in december had the aging bug too.

I'm on pc. I tried to remove mods and repair but the bug remains.

Edit : I've checked the backups I do before updates. The most recent save I have that works fine is the one before the november 14th update.

After the recent update (March 2026), I've been having issues in existing save files with sims auto-aging. When loading the game (auto-aging is on, normal life span), all my sims and NPC's age up, and the elderly sims die. If I pause the game straight away and turn off auto-aging, it doesn't seem to have any issues. I've tried turning off auto-aging and turning it back on again later, and it triggers the process again. I've tried recovering older saves, as well as removing all mods and custom content too. Any help would be greatly appreciated!! Thanks so much

Same here. I found most teen pre-made sims age up to young adult involuntarily. I mostly play short and long life span recently since I've been crafting family tree legacy, either only active household or all played households and NEVER enable aging unplayed households. Specifically, Rashidah from Hanford, Greta Laurent from Tartosa, Luz Lopez from Ciudad Enamorada, Savannah Price from Copperdale. I'm not sure if there's something to do with HSY graduation?