puberty has been starting increasingly earlier for girls. google it. http://tlc.howstuffworks.com/family/earlier-girls-puberty.htm read this article! it's good. On the third page, it says this in a box
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We have so much food available now that our bodies know we have very little chance of starving. Might as well breed early then.
dayum....i read this yesterday and had to just wonder WTF is going on... i think they said the father was 13...crazy