People here seem very against this, but I don't really see it. This only require to have a form asking about your age and provide an API to read it, right? Surely I'm missing something? Is the backlash due to fear of a slippery slope?
What that means is that we will have to amp it up, if we want to achieve it's purpose. So, that's not a slippery slope, that's a prophecy.
When we get cryptographically backed identity verification on all computing, that will legitimately be the end of computing as we know it.