No you don't, but like I say, I'm talking about the majority of users.

Again though, and I'm copying this from a previous response, I think it's worth remembering that this is a suggestion, and not even originally mine. If you're happier to use the current multitude of age verification services that differ on a per-site basis, with all the security vulnerabilities, risk, and inconvenience that entails, then feel free. Or bypass them using the methods suggested.

I'm literally just providing a better technical solution than has been implemented. What I'm not suggesting is "this is the answer to everyone's problem".

You're welcome to Google "device-based age verification" to get any answers you need, from wiser minds than mine.