Adwords now has demographics? (US only)
Sourced From https://adwords.google.com/support
What is demographic site selection?
Demographic site selection is a way to find and run your ads on sites with the right audience for your AdWords campaigns.
A demographic group is an audience that shares a particular trait or characteristic. This trait might be age, gender, income or some other factor. If your product appeals to young women, for instance, you might want to target sites which are popular with the female demographic, the 18-24 age demographic or both.