alt Hacker NewsInstead of the client sending the user's age to the server, why not make the server send a minimum age to the client? The client is welcome to block content without disclosing personal information to the server. This is as secure as sending an unverified age to the servet.
Because the requirements being placed on social media sites are much more nuanced than simply allowing or blocking content... to implement this all in the OS or browser would require an exponentially more complicated API.