I have a child stuck, not wanting to age, yet it's her birthday. I have Nraas MC, and I've tried triggering the age, but it just has a brief moment to celebrate, then it goes away. I can't take her in...
Since you already have MasterController, try doing an MC Reset on the sim. Overwatch tends to be on the lookout for age stuck sims and fixes them as it finds them, but that can take a sim day or two to happen by itself.
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