Yeah the most likely thing (for the California law, at least) is that compliant OS's expose a form at account creation where you input a birthdate or age, and h

Yeah the most likely thing (for the California law, at least) is that compliant OS's expose a form at account creation where you input a birthdate or age, and have either a CLI/file/setting where you can change the birthdate or age with admin permissions. No verification is needed