If the system is that I have to prove my id or age for averag network connections, then the system has already failed me. The only system I am behind is a flag

If the system is that I have to prove my id or age for averag network connections, then the system has already failed me. The only system I am behind is a flag that some devices can send if enabled that lets the receiving party know the user is underage. Completely optional (controllable by device owner/guardian) but if received, that party must behave in a way that acknowledges that fact. It is not a perfect system, but it retains the freedoms and anonymity of the user.