The proof is her df. It ages her brain obviously, you're making weird exceptions. Her brain aging won't necessarily give her more than 12 years of experiences and memories though. Nor necessarily make her super mature.
But objectively her brain would have aged along with body. Anything else is...
No she's not. Maturity or immaturity are not proof of age.
You need a looot more than your headcanon to disprove the established function of her df ability. "Look she's scared of bugs" is not cutting it.
Stop spouting headcanon man, Bonney acting childish when she's an adult doesn't disprove what her df ability does. 19 year olds can be immature af, I've seen grown men run from bugs like they seen a ghost.
And we see mature children in anime all the time too. What really gives it away is when...
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