Hit control shift c and open up the cheat window. Then type in
testingcheatsenabled true and press enter. Shift click your Sim and there should be an option to 'Trigger Age Transition'. If you press that, you can age your Sim as much as you please.
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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.
Sims will age up in the Sims 3. If you are currently playing as the sim to see when they are going to age up go to the plumbob next to inventories then hover you cursor over the green bar. To make your sim age up either buy a birthday cake from the grocery store or from buy mode, categories, entertainment, parties, cake or you can go to the 3 dots above your sims head, click on options, go to the plumbob shape and adjust the age your sim has to be to age up. You can also use a cheat, press down control shift c. Type in testingcheatsenabled true then press enter. Hold down shift and click on the sim you want to age up. Click on trigger age transaction.
You can use the cheat boolProp testingCheatsEnabled true code then Shift lick on the sim you want to age and click "Set to Birthday" then you click on the sim and hit grow up. they will proceed into the next stage of life.
Bring up the cheat box ( ctrl shift c) and type aging off, to turn it back on just bring up the cheat box again and type aging on.
It's similar to how you age sims. Have the boolprop TestingCheatsEnabled true cheat on. You have to have a sim selected, then simply shift click on a puppy and choose the "SET TO BIRTHDAY" option. Hope it works, did for me!