I generally think that children's access to the internet needs to be more closely monitored. You wouldn't allow your child to walk up to random strangers in the street without you there, why do we allow it online? I have on a few occasions had to protect a child from an adult in an online group.

What concerns me here is how this will be enforced. The only way to implement this is with IDs to check birth dates, and some method to confirm you are the person on the ID. You could imagine this being consolidated into a government ID system to 'protect your data', and to mean you only have to validate once. These accounts will be permanently attached to real people, and I think it will have a chilling effect on free speech. It's all fun and games until the government of the day considers your speech as a threat.

One can see this being expanded too, so that you would need to provide ID to use the internet more generally. ISPs could be told to selectively deliver web pages from DNS based on your ID, which would be most effective on mobile devices and less so on wired networks. My ISP already blocks websites.

I think a more fundamental question is whether the nanny state should be telling you how to raise your children, what content they can consume and who they can interact with. Suddenly you find your children consuming content only from a Z-wing bias because the government of the day hates Y-wing politics.