The death of a sim can be an emotional time. The Grim Reaper shows up with his scythe in hand, the family gathers around to send their loved one off, and a period of mourning descends upon the house. But, if a Sim has lived a good, long life, this can also be a chance for celebration in recognition of time well spent.
However, a new glitch was accidentally introduced in a recent update for The Sims 4, and it is fast tracking this whole process. This means that some elderly sims have been dropping dead well before their time. As well as this, children are rapidly becoming teens, teens becoming young adults and so on.
Players are reporting this all happening after a visit to create-a-sim (CAS), or during the loading screens. This is even when the game's "Long Lifespan" is enabled.