@LaggyNinjaK1LL you don't want to stay young forever? Goodness, what's wrong with you lol. Just joking of course, I couldn't resist 🙂
So there are two ways of doing it with testingcheatsenabled, try the other method:
- open cheat console (shift, ctrl, c)
- type in: testingcheatsenabled true
- shift-click on your sim and choose "Edit in Create-A-Sim" (or something like that)
- change her to an adult and accept changes and go back into live mode and play for a little while
- then go back to CAS (above) and make her back into a young adult and accept changes
Play for a couple of days - does she age?
If it doesn't, I would try saving her to the library via edit town and creating a new save and putting her in
