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Because boys (apparently) take longer to mature than girls.
Teen-Aged - 2008 was released on:
USA: 3 December 2008
most teen aged look up at facebook,myspace,twitter,games,youtube,pornography
Kids aged 13-17 can play Teen Second Life (teen.secondlife.com).
Other Recommendations:
habbo hotel, meez.com, weeworld.com, and kewlchat.com
pop pop