Here's Riko Tomizawa's It-Girl DVD (AXO-001) released on 2008/06/25 and posted to lovedol.net on 2009/03/17. I found a couple of retailers that say she's 16 years old in their descriptions of this DVD.
http://rapidshare.com/files/215759874/axo_001.part1.rar
http://rapidshare.com/files/215759880/axo_001.part2.rar
http://rapidshare.com/files/215798328/axo_001.part3.rar
http://rapidshare.com/files/215798331/axo_001.part4.rar
http://rapidshare.com/files/215947308/axo_001.part5.rar
http://rapidshare.com/files/215947310/axo_001.part6.rar
http://rapidshare.com/files/215950947/axo_001.part7.rar
PW: Authorised-BMN
http://rapidshare.com/files/215759874/axo_001.part1.rar
http://rapidshare.com/files/215759880/axo_001.part2.rar
http://rapidshare.com/files/215798328/axo_001.part3.rar
http://rapidshare.com/files/215798331/axo_001.part4.rar
http://rapidshare.com/files/215947308/axo_001.part5.rar
http://rapidshare.com/files/215947310/axo_001.part6.rar
http://rapidshare.com/files/215950947/axo_001.part7.rar
PW: Authorised-BMN