You’re assuming age of consent is about puberty, reproduction, but age of consent is about being intellectually capable of understanding and having responsibility for actions, which isn’t something you can measure in a physical sense.
“the conclusion of sexual development allows a person to have sex without sustaining damage” this is baseless and incorrect and fucking creepy as shit, tbh.
Being able to reproduce is completely irrelevant to whether a person is ready and able to enter into a sexual relationship. You’re making shit up to skirt around that. That’s creepy as fuck, you sound like you’re trying to excuse child abuse.