At least the ways that a corner shop verifies age don't have the same downsides as typical online age verifiers. They just look at an ID document; verify that it's on the official list of acceptable ID documents, seems to be genuine and valid and unexpired, appears to relate to the person buying the product, and shows an old enough age; and hand the document back.
The corner shop has far fewer false negatives, far lower data privacy risk, and clear rules that if applied precisely won't add any prejudice about things like skin color or country of origin to whatever prejudice already exists in the person doing the verification.
The corner shop has far fewer false negatives, far lower data privacy risk, and clear rules that if applied precisely won't add any prejudice about things like skin color or country of origin to whatever prejudice already exists in the person doing the verification.