Re: Aging down a SIM
@Lilith131367 , if you haven't saved the game yet after your Sim aged up, then you can just quit the game without saving and start your game again.🙂
However, if you have saved that game file after your Sim accidentally aged up, that is a bit trickier. The best way would be if you had an additional older save file of the same household (though you would loose any gameplay that you have gone through with the most recent save file of that household). I realize that it isn't likely that you would have an older additional save file of the game. 😔
These are the only ways I know how , since using an age potion would just bring them back to the beginning of their current age, as it can't bring them back to a previous age. 😞😢
It is possible that there is a mod that will allow age reversal, but I don't play with mods since they require maintenance to keep them working, and I'm too lazy to do that! 😃
Best of luck, and feel free to update us on your situation! 😇