Does that explain why most societies don't permit children to drive cars? Perhaps that's not based on development, but just being too short? I kid, but clearly we don't let children drive, vote, drink alcohol, have sex etc. because of general observations about their limits, including self-control.
We don't let children vote because they are not wise enough: we demand a threshold for accrued mental competence is gained. Similarly, cars give them a power similar to that of guns: hence the restriction past the threshold.
We don't let children damage themselves because it is plain indefensible. If they want to, they must have passed said formal threshold.
Technically in the US farmer's kids can drive at 12 without a license if they are on "farm business" including hauling massive loads, both with tractors and regular cars and trucks. If they wanted they could put an unsecured goat in the back seat of an unlicensed car and drive to town with it.
Somewhat relatedly, there are US states where the age of consent (for sex with an older partner) is 13 years old, and the age of consent for marriage is 16.
Define "sex with an older partner". I'm pretty sure that for sex with someone of arbitrary older age, the age of consent is 16-18 in every state. If you're counting limited age difference then you might be right but that phrasing is misleading