How to stop aging on played sims

sims-4

So I'm writing a Sims 4 based story-slash-playthrough, but I would need to stop aging on a household that I have played. I know you can control aging on unplayed households, but I'm wondering if you can stop aging on a played household.

If that is not possible, then is it possible to revert a played household to an unplayed state without losing what was done with that sim?

Thanks!

Best Answer

Click the options menu in the top right, then Game Options (Second button down) then go to the Gameplay tab, and finally change Auto Age (Played Sims) to No.