You can opt out of showing ads that are based on user interest and demographic categories (for example, 'sports enthusiasts' or 'inferred age: 18-34'). In turn, Google will not use visitation information from your sites to help create interest and demographic categories. However, you cannot opt out of showing ads to users based on their previous interactions with the advertiser, such as visits to an advertiser's website.
To opt out of ads based on user interest and demographic categories:
- Sign in to your account at http://www.google.com/adsense.
- Visit the Allow & block ads tab.
- In the sidebar, choose Advanced settings.
- Click the checkbox next to the interest-based advertising preference so that it reads "Do not show ads based on user interest categories."
Please keep in mind that by opting out, you'll decrease the number of ads competing to appear on your website, which may decrease your potential earnings.
Ads you've blocked by category, by advertiser URL, or using the ad review center will not appear to users through interest-based advertising.