Their age range between 11-19
(youngest to oldest: 11, 13, 14, 18, and 19)
They debuted month actually.
you may recall them from the same event that s/mileage, momoclo, SKE, and TGS were in.
Left to right:
http://ameblo.jp/miyatake51161/ (yes Mio and Matsuri sisters it seems)
Sakuraba's webpage (thank you myrmidon)
There's still info yet to be found here (in other words this first post is still somewhat under construction), but they're really sweet. and the little Matsuri, she's just SOOO CUTE!