Why is there 12 years old in this app?

Like why would 12 year olds on here if they're not even pregnant!? Talking about sex and stuff like that.  I mean if you're curious I understand but why join a <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a>? I bet there are other groups for you girls.