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.