back in my time as an (inadvisably) precociously online kid, the only real age barrier was having a credit card, so i had to beg/borrow/steal my way to someone on irc giving me a shell to a vps, and pay some other rando with a steam gift card to buy a domain then transfer it to my registrar account. and like that, i could start developing a presence in whatever online communities i insinuated myself into by acting mature enough nobody gave my age a second thought. physical realities like divorce and school troubles came and went, but moving and shaking online gave me my most steadfast friends and s/o to this day.
shift the timeframe a couple decades and i would have instead been gated by an id upload. bleak.
That might be simpler. Estimating age with a camera is already common in China. Cameras are cheap, and displays now probably have enough processing power to do it locally.
Will work for TVs, too.
It would probably also be a good idea to find a way to ban gambling mechanics in games because if we recognize casinos as vices that lead to widespread social dysfunction and that children have no business whatsoever interacting with them then it follows that gacha games are very clearly an end run around the spirit of the law.