Teens TTC?

So I'm having trouble with a few posts I've seen lately, some 16 year old girls are TTC. I could somewhat understand 19-18 but younger than that I'm just baffled. So why is it okay to purposely conceive at such a young age? Why not? First hand experience? Can you justify TTC at such a young age?? Did you know there was a group for TTC under 20 and its full of 14-17(majority) year olds ttc? This is very taboo to me. Your brain isn't even fully matured until your 20s. Just.. What... 

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