Young girls looking 20?

Every year younger girls 13-16 are looking older & older. Why is this? Whenever I was 13, I actually looked it! Why is this okay? I know someone who accidentally got a 14 year old pregnant, because the girl looked way older, and she even lied about her age!!!

Young girls taking pics for Instagram or Facebook, practically wearing nothing & their parents are OKAY with this?!?!?!

What has this world come to?