Maybe it should be possible for a parent to set a child age in a device.
Everyone else can stay anonymous.
I look forward to hearing why that won't work and what problems it will cause.
How does the parent prove they are the parent. All you need is to think about the next step, come on now.
You're describing California AB1043 which passed a few months ago and is now the law in California. We all got very angry about it when it passed.