Americans yearn to be young. So it is little wonder that RealAge, which promises to help shave years off your age, has become one of the most popular tests on the Internet.
According to RealAge, more than 27 million people have taken the test, which asks 150 or so questions about lifestyle and family history to assign a "biological age," how young or old your habits make you. Then, RealAge makes recommendations on how to get "younger," like taking multivitamins, eating breakfast and flossing your teeth. Nine million of those people have signed up to become RealAge members.