https://www.ftc.gov/business-guidance/resources/complying-co...
>If you choose to block children under 13 on your general audience site or service, you should take care to design your age screen in a manner that does not encourage children to falsify their ages to gain access to your site or service. Ask age information in a neutral manner at the point at which you invite visitors to provide personal information or to create a user ID.
>In designing a neutral age-screening mechanism, you should consider:
>Making sure the data entry point allows users to enter their age accurately. An example of a neutral age-screen would be a system that allows a user freely to enter month and year of birth. A site that includes a drop-down menu that only permits users to enter birth years making them 13 or older would not be considered a neutral age-screening mechanism since children cannot enter their correct ages on that site.
>Avoiding encouraging children to falsify their age information, for example, by stating that visitors under 13 cannot participate or should ask their parents before participating. In addition, simply including a check box stating, “I am over 12 years old” would not be considered a neutral age-screening mechanism.
