ITT: a bunch of snowflakes who don't realize that for 99.9999% of human history, humans usually had children by the age of 14. The saying is crass but, if they can bleed, they can breed.
Well no, the line is whether they have had the hormonal change which causes sexual organs to develop. Pubic hair, breasts, facial hair, musculature, etc. You know, when the difference between boys and girls becomes obvious.