>>82263036
The age of consent should be 14 or 15 unless you are the parent, guardian, or teacher of the young adult. Simple as.
Otherwise, the age of consent should be 30 to make sure everyone is fully developed and has had some time to get used to their maturity.
Absolutely nothing in between, 16 (but actually not) is convoluted, 18 is both too late and too early, 21 is too early because you're not fully developed by then, and 25 is you just coming fresh out of your development.