I honestly think this is a bad/dumb idea. Age verification in general is just silly on the internet and laws mandating it are inane.

The main thrust of such measures is "Let's make sure a kid can't see/access this". However, without an actual camera to double check that "yes indeedy, this really is the person attached to the ID" then "faking" it is all too simple. I can almost guarantee you'll get IDs floating around the internet which kids will use to completely bypass these protections (or they'll simply swipe their parents' ids when they aren't looking). It's a half step above "what's your birthday" checks.