User blog comment:DaNASCAT/Technical Update: January 15, 2013/@comment-207.237.168.45-20130124221252/@comment-3448772-20130125000630

COPPA doesn't mean that are under the age of 13 can't have accounts. It just prohibits Wikia from collecting/using most types of personal information from people under the age of 13.

"8) PERSONAL INFORMATION.—The term "personal information" means individually identifiable information about an individual collected online, including—

(A) a first and last name; 

(B) a home or other physical address including street name and name of a city or town; 

(C) an e-mail address; 

(D) a telephone number; 

(E) a Social Security number; 

(F) any other identifier that the Commission determines permits the physical or online contacting of a specific individual; or 

(G) information concerning the child or the parents of that child that the website collects online from the child and combines with an identifier described in this paragraph." - http://www.coppa.org/coppa.htm

Sadly, most of the specified personal informations are important to keeping track of different accounts, which generally makes it unlikely for a system to be made to help in relation to the exclusion of people under the age of 13. Which sometimes causes problems to younger editors, who due to a lack of an account cannot due various things needed to fully edit a wiki. It rarely happens, but occasionally people who have the skill to make full use of those features are unable to do so.