Age Verifications: where do you draw the line?

choose all that applies

boosts appreciated 

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

@kuriko the idea is already too much. Trust me if we agree with a checkbox. The next step will become creating a photo of your face.

Then the next step after that, will be uploading your ID. Etc. Etc.