I'm not a libertarian; I just don't get why I should have to prove my age on every device I own regardless of what I access online when I don't have kids. Parental controls already exist on devices, so that's not really what this is legislation is proposing. I don't have a concrete solution because I don't even agree that "theoretically we don't know for sure that this device couldn't be used by a child to access pornography" is a problem that it's my job to solve as someone with no kids and plenty of mundane uses of the internet like paying bills, contacting medical providers, filing taxes, etc.