Around what age do most people raised or born in the United States start to mature?

It seems that most females raised or born in the United States start to mature in their mid to late twenties and most males raised or born in the United States start to mature in their late twenties to early 30s. A lot more women are nice when they mature (obviously) and a lot more men are nice when they mature (obviously). Before most males and females mature most of them are just you know what lol. Only some are nice.
Around what age do most people raised or born in the United States start to mature?
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