New Lifespans for the Sims
Each age group got a new number of days for their lifespan.
Sims randomly age after loading into Live Mode
This bug was fixed in Patch 1.90.375. Be aware that you still can be hit by an change in age initially as Maxis changed the length of the livespans
Sims/Pets don’t age with birthday cake/ age-up treat
Pets and Sims older than toddlers can age again with the cake but toddlers are still having issues.
My Sims age randomly changes
This bug was fixed in Patch 1.47.51.
Sim don’t age/die anymore
That some Sims don't die or age is caused by certain traits of the Sims.