Board Thread:Questions and Answers/@comment-24487529-20150302230813

In Volume 2 of the light novel, Kirito infers that Yui cannot be a player based on, among other things, the fact that she's not even 10, and the NerveGear is only for kids 13 and older. However, Silica, who's introduced in the same volume, is 12 as of the start of the Aincrad arc, and Sasha, later on in the same arc that Yui is introduced, says that some of the kids are elementary to middle school age, which would imply that some of them are under 13. What does this say about the restrictions on the NerveGear? Is using the NerveGear not recommended for those young children, rather than absolutely forbidden, are people ignoring the warnings, or what other explanations are there? 