Sorry, no. I don't trust a government API/website with my personal information. They collect and abuse the private data that I DON'T willingly give them access to. Imagine what they'd do with the data I do.
Denmark have MitID, which is a sort of government OIDC/OAuth2 thing. There's no issue in having it expose only a single claim, such as age, or adult=true/false in age verification scope. You don't have to open the floodgates to government data, in fact Denmark has navigated that pretty well through the last three iterations of our government issues online ID scheme. There's even laws preventing cross referencing data from different database, in the case that you for some reason have access to it.