It's an interesting litmus test because regulators would not accept ZK age proofs unless the stated purpose of age verification laws (reduce harm to minors) is the _actual_ purpose of those laws.
Not some different unstated goal, such as ending online anonymity.
That is exactly what EU is doing with its age verification law. Basically the service provider just has to accept the certificate and check that it is valid and all the cert says is "is over X years old".
https://ageverification.dev/
And the fact that the companies have to implement the system themselves is just crazy. It is very obvious that if the government require such a check it has to provide the proof/way of checking just like in the physical world it provides the id card/passport/etc used for checking this.