Sim don’t age/die anymore

Problem

My Sim doesn’t age anymore. The age bar is full but the Sim doesn’t age up.

When I try to age him with the birthday cake, I get a message that the Sim is not eligible for aging.

My Sim also doesn’t die. I tried all kinds of methods but he survives everything.

Cause

Immortal Sims usually have a certain hidden trait.

Meeting the Nanny makes Sims immortal

Sim is pregnant.
Certain pre-made Sims are immortal like Baby Ariel.
Sims with the Weirdo-Trait are immortal
Sims that repair stuff around San Myshuno are immortal
Sims that used to be Detective Career criminal

Solution

Do the following steps to use the cheat console

Open the cheat console with ctl-shift-c
Enter the cheat you need in the entry box which appeared in the upper left corner of your screen.
Hit ENTER
Repeat steps 2 & 3 for every necessary cheat.
After entering all needed cheats, close the cheat console with ctl-shift-c

This trait can be remove via cheat which in turn lets the Sim age and die again. Don’t try this for pregnant Sims. Wait til the baby is born and the Sim will go back to aging.

Needed Cheats

testingcheats true
traits.remove_trait <Name do the trait>

Known traits to cause this

~~HasMetNanny~~
isWeirdo
isCityRepair
DetectiveCareer_Criminal
SpecialNPCs_BabyAriel

Finding hidden traits (Mods needed)

Show/Search Sim Info Mod von Frankk can help you figure out which hidden trait is causing the issue of if there’s a different cause.

Vorgehen

Click on the Sim and choose Show Sim Info – This Sim. You will get an infobox. On the first page you will see if your Sim can age and die.

If it says Disable change to Hidden Traits and check which traits your Sim has. The box should contain info which trait is making your Sim immortal as well as the exact name so you can remove it with the cheat.