Don’t get me wrong, I’m all for privacy. But between setting up the birthdate when creating my children’s local account on their computers, and having to send a copy of their ID to every platform under the sun, I’d easily chose the former.
I’d even agree to a simple protocol (HTTP X-Over-18 / X-Over-21 headers?) to that.
That’s your decision. The rest of us shouldn’t be forced into it just because you’re to lazy to watch what your kids are doing online. If a website thinks they need to my my age they can ask me and I’ll decide if I want to provide it or not. I don’t want my OS just handing it out to anyone who asks.
Genuine question, what if the only information it hands out is that you are over 18? Would it be different if all it was able to say is you aren’t a child?