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.
So you support adding a field for your SSN too? It’s just going to be stored in a database on your PC so why not??
Yeah, and I’m never going to use it, just like I don’t use any of the other existing fields - it doesn’t matter.