Yeah we have something similar here in Finland with banks doing most of the (strong) identification.
This also makes things difficult for immigrants for the first month or two in the country as a lot of services (like making a phone or internet contract) require this identification to use but it is also a bit of a hassle to get a bank account (but getting a new bank account in a different bank once you have a bank account to do the strong verification takes like 2 minutes)
There is a government system but most don't use it but I expect once the eu digital identity wallet thing rolls around a lot of ppl will switch (or be required to?) to that
https://commission.europa.eu/strategy-and-policy/priorities-...
But very importantly this government, bank id, the identification part of the eu id wallet or really any identification system should not be used for age verification as it actually identifies the user not just give a proof that the user is over X years old.
These systems likely could be extended to just provide age information. If there truly was a wish for it. The suomi.fi systems can be configured. To pass or not pass address for example. So I see no need to pass personal identity number.
Yes and the "backend" (what provides the certificate to the app) for the age verification app for Finland will most likely be suomi.fi (or some dvv.fi thing directly) systems.
But we can't realistically expect every service that needs age check to work with 27 (eu countries) different systems but instead we need to unify it into a single api contract which is what this age verification app basically does.