I found a way to fix the problem. Go round the world and click on all of the sims, resetting them. Eventually, the game will go back to normal. That's what I did.
Just to update this thread -
We have plans to address this in a future update, but due to the complexity of the issue, it will take some time.
This is kind of joke, right? This game is 3 years old and you started fixing MAJOR issue only NOW?
I can bet that there will be no fix for this, but new Sims 5 release with the same bug. SIC!
Easiest way I found to fix this, when you load up your game, do NOT select the household you are having issues with to play. Simply select a household and wait a small while until the sims in your normal household has aged. If the household you are currently playing knows the sims that are aging up, look in the relationships tab and wait for the sim to display the age that they are growing into. Then switch to them.
"This is kind of joke, right?" There are no words how i could say this better myself. This is by very far the most expensive game i have ever owned. It is now almost 4 years old and so is this thread.
With that in mind having such a game breaking bug still in the game for which you actively sell content for is a bigger slap in the face of every consumer than any other battlefield press debacle can possibly be.
Not only did i have this issue multiple times with aging up now it also happened with adoption as well. So this save game that i spend 100+ hours on , and for that matter the game in general is pretty much trash unless i manually save every 5 mins.
I am by no means a stranger to playing early access titles, betas or mods. From the bethesda games to arma mods, you name it and I've probably done it.
Yet this is the worst and ironically the most expensive experience I have ever had.
And this is definitely not a helpful post, but in a thread where the general consensus is that there's nothing that can be done that hardly matters anyway.