Firstly, I quoted the average age of prostitutes as 13; apparently the claim, even in the documentary, is that of the age of entry into prostitution. My mistake.<p>Secondly, I've been trying to track down the original reference. The Justice department has a page here:<p><a href="http://www.justice.gov/criminal/ceos/prostitution.html" rel="nofollow">http://www.justice.gov/criminal/ceos/prostitution.html</a><p>Listing a reference to a report by Estes et. al. which was located here: <a href="http://caster.ssw.upenn.edu/~restes/CSEC.htm" rel="nofollow">http://caster.ssw.upenn.edu/~restes/CSEC.htm</a><p>But is now not available. The specific claim is supported to be on page 92.