

An optional field was added to the userdb to allow storing birthdate. That’s it.
The systemd project merged a pull request adding a new birthDate field to the JSON user records managed by userdb in response to the age verification laws of California, Colorado, and Brazil.
This is the same record that already holds basic user metadata like realName, emailAddress, and location. The field stores a full date in YYYY-MM-DD format and can only be set by administrators, not by users themselves.
An optional field in the userdb JSON object. It’s not a policy engine, not an API for apps. We just define the field, so that it’s standardized iff [sic] people want to store the date there, but it’s entirely optional.
–Lennart Poettering























And you can take your thumbs and do this with them: