Type in boolprop testingcheatsenabled true (exactly that way) and click on your Sim whilst holding down shift. Click on the button that says 'Spawn' and then go to the second page of 'Spawn'. There will be a button that says Sim Modder, click on that and Sim Modder will appear as a baby. Click on it and choose age, then click on what age you want. It will make them that exact age, but will change the hair and makeup.
Hope this helps (:
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As far as I know, there is not a cheat that can make sims younger again. Sorry.
you can buy a cake and then use it
Simple! The Elixir of Life, extends your sims life by 3 days. Can be used 5 times. **But somethig even easier is using a cheat:** CTRL+SHIFT+C opens the cheat box, type in: agesimscheat on then press enter. click on your sim, one new opion will be "set age" click on it. you can make your sim any age now, without the elixir of life... actuallly ive never heard of it XD Make sure not to forget typing in "on" after agesimscheat, because in the past, i had just forgot "on" and messed the whole cheat up! lol happy simming!
There is a cheat but you can't choose choose your age you only can age up one. You type in the cheat box testingcheatsenabled on and press contol and click and select trigger age transition.
to change your sims age you can use boolprop testingcheatsEnabled true and then hold down shift and press on the trash can in front of the lot..you can also use this cheat on other objects (like the mail box!) and on other sims. just hold shift and click.