In adcenter their demographic targeting only works if the user is logged into their msn/hotmail account otherwise your ads will still be viewable to everyone.

If you want to target just 18-24 year olds then you'd select that box. There's no need to touch the incremental bidding on that same page unless you want to pay more to have your ads viewable to more people.

free e-mail accounts, user profiles, and etc. They have relationships with people that release data to them. Then on top of that, you have to remember they own properties that are driving huge amounts of traffic.

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MSN adCenter’s demographic targeting allows advertisers to “influence” the position of the ads for specific demographics. It’s more of demographic bidding. The advertiser bids more on ads that he wants to target at the desired prospect coming under a specific age group or at a specific gender. Here, the demography can be broken down by age, gender, geographic location, day of the week, and time of the day, and more.

The most popular and profitable PPC search engine Adwords offers demographic site selection. AdWords Placement Tool allows the advertiser to select preferences in up to three different demographic categories. Google says that their system analyzes the selected preferences and compiles a list of available Google Network sites that are popular with that audience. Demographic site selection is a way to find and run the ads on sites with the right audience for a particular campaign.

With Demographic Targeting solution offered by Yahoo, advertisers are able to reach consumers identified by their demographic characteristics such as age and gender. Unlike adCenter and Adwords, Yahoo! Demographic Targeting is powered by age and gender information that is provided by consumers themselves.