User blog comment:Semanticdrifter/Updates to COPPA/@comment-5691231-20130624194032/@comment-1216259-20130624202450

We expect that based on an anonymous poll that was actually taken. The poll had 144 participants, a decent sample size.

See, you're making a False Assumption, that because a lot of kids watch Avatar, most of the Wiki users must be kids. However, not everyone who watches a show contributes to fansites, with most kids being more casual fans, watching a lot of cartoons, but not following news on any of them.

Also, Last Airbender had ~4 million fans at its height, & Legend of Korra has ~6 million fans now. If we assume that the set of LoK fans contains the set of Last Airbender fans, most of them are older than 13.

There are some problems with these inferences, but they still illustrate the point: You can't make good conclusions from relying on superficial characteristics like the age of the title character or whether or not it's animated. See: anime. Animated, often features young protagonists, but unless it is heavily edited, it's often considered "adult programming" when it comes over to the west.