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Pause the game and go to options and you should have: Pet Lifespan from Brief to immortal, if it's on immortal they won't age up. If it's on brief they should age up in a couple days. You could do that if you want and then when they aged up you can change it back to immortal if you want to keep it as a adult.

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Q: How do your pets age up in the Sims 3 Pets?
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