User blog comment:Trollipopz/Who wants to defeat the new bosses with me when 1.1 comes out?/@comment-4085927-20111201154553/@comment-4085927-20111203151406

If your 13 that's fine if your 12 or under, then there's a problem. I'm not really sure on the reason, this is all the info wikia staff give us:

"While you may use this Service without registering for membership, membership in the Service is void where prohibited by law, and is intended solely for users who are thirteen (13) years of age or older. Any registration by anyone under 13 is unauthorized, unlicensed and in violation of these Terms of Use. By registering the Service or the Site, you represent and warrant that you are 13 or older and that you agree to and to abide by all of the terms and conditions of this Agreement. "

But i believe it has something to do with the American advertisement laws, as most American based sites have the same rules. The laws prevent advertisement being targeted at people under 13 (12 or younger) and having an account allows the site to send you more targeted info.