Hi, I don't want to wait any longer for my sim kids to age up, so I hosted a birthday and selected one of my kids as the birthday sim and got a birthday cake with candles. When I had the sim in que...
Make a cake, click on it and choose add birthday candles. If it's your household sim, click on that cake and blow candles. If it's NPC sim, get one of your sims to talk to him/her then click on the cake and choose option "age up sim".
You don't need to set a party for that, although it would be nice to do for your sims' kids.
--- NPC = non-playing or non-player character, depends on the publisher, article maker, developer, etc
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