Come July 15, , internet users in Britain attempting to visit major pornography sites will be confronted with a question: How old are you? Then, a follow-up: Can you prove it? Users can verify their age online, by submitting official government IDs or credit card information. Or they can walk into a store and establish their eligibility to access porn the old-fashioned way: by handing money and identification over to a human being, at a participating store, in exchange for a pass.