For those interested on the question of age verification and GNU/Linux: be aware that Systemd v261-rc1 was recently released. It now implements an optional birth date field in the JSON user database (see second item under “Other changes”).
The implementation of this field was prompted by age-verification or -attestation laws.
That is so true. For me, who works as a Systemadministrator, systemd is about the best thing that happened to linux in a long time! It makes my work so much easier