Hello All You Educated Men of Fifty and Above

I came across a site Quantcast, a site that provides visitor demographics for other websites. According to this, the Bardic Press site "reaches fewer than 2000 U.S. monthly people. The site appeals to a HH income up to $60k, more educated, 50+, rather male audience"

Then there is a set of graphs breaking down visitors by age, sex, race, etc. It all seems rather unbelieavable. Are 13% of visitors really aged between 12-17 and 34% above 50? 12% Hispanic? 74% don't have children? Where do they get this stuff from?