Google launched ID-less age approximation in July in the US:

https://blog.google/technology/safety-security/age-assurance...

> Age verification: If we incorrectly estimate a user to be under 18, the user has the option to correct their age, including by uploading a photo of their government ID or a selfie.

Hopefully false positives won't be set high and this abused as an excuse to obtain sensitive personal information on their users.

And kids rapidly realized that watching a few videos on taxes would bump them into the adult category.

Amazing, that's exactly what I had in mind.