How does Flickr know how old I am?
Flickr knows everything, all the time. When you sign up for a Yahoo! account, you’re asked to specify your age as a part of the account creation process. Flickr is able to grab that information when you sign in to your Flickr account. As of March 20 2007, age has been removed from Flickr profiles, and isn’t displayed on the site anywhere. We simply use age to determine whether or not members can have access to content that’s been placed in the ‘restricted’ category.
