@apropos @xianc78 i wonder what the feasibility would be of something like, you put your driver's license ID number in to a website and it sends a signal to some government service to check the DoB on the card correlating to that number. it can then send a signal back to verify that the person is above 18, or 21, or whatever.
i would say you could just verify with credit cards, since you need to be 18 to get one, but that FURTHER incentivizes credit which i don't think is necessarily a good thing. i think the wrong people would benefit from that kind of requirement.