Age Verifications: where do you draw the line?

choose all that applies

boosts appreciated 

against with the idea in principle (no other options applies)
34.8%
a self-certifying checkbox is okay
47.9%
offline verification of ID document is okay (via reading chip or OCR)
7.2%
Credit card verification is okay (if you have one you are >18)
5.9%
Mobile operator verification is okay (if you have a contract you are >18)
2.7%
First party online verification is okay (upload ID or photo to the website you are using)
0.4%
Third party online verification is okay (upload ID or photo to another website)
0.2%
other (write in)
1%
Poll ended at .

@kuriko Most of those options are data collection systems, and thus should be disliked especially due to leaks. If anything, it could be done at a store or point of sale by requiring an adult to buy the phone (and enabling protected mode if it's for someone young).

Doesn't protect against having an adult authenticate, then passing it to a child, because those verification things look generic at first glance.

The one I might like is the one in Leisure Suit Larry, if it weren't for it relying on now-stale trivia.