I don't know how they are going to do over there.
Here the plan for the same goal is force any social media company to request a digital certificate when entering, or directly overtaking the ip of the social media and force a certificate check to let the user through. This certificates would be expedited by the government to people over certain age.
The haven't implemented yet, as they were going to start using the system to ban porn for minors and got a lot of backslash.
It's technologically doable, some kid will always find a way to enter but vast majority will not (next to a bunch of adults that will stop using them because they cannot be bothered with the same system). Moral considerations aside.