What is demographic bidding? It's a feature that helps you target your ads to users of a particular age group (such as ages 18-24), by gender, or to combinations of those groups. You can use demographic bidding whether you are using contextual or placement targeting and with both CPC and CPM bidding. You can refine your reach based on users' gender and age on certain sites in the Google content network such as MySpace and Friendster, whose users provide that information about themselves. AdWords receives the data in anonymous and aggregate form from participating partner sites, which means that users can't be personally identified.