Literally why the AoC is age based and not development based because nobody is going to be the same as someone else. 18 is picked as a catch all so the majority are going to be considered, outliers will still exist who have yet to completely undergo puberty, but again that's the point about why it's set at 18.
Islam has its own issues with pedophilia. Namely, Mohammed himself.
She was six when they were married, nine when it was consummated. (He was around fifty).
Totally fine.
Literally why the AoC is age based and not development based because nobody is going to be the same as someone else. 18 is picked as a catch all so the majority are going to be considered, outliers will still exist who have yet to completely undergo puberty, but again that's the point about why it's set at 18.