There isn’t a global law about age verification they countries could be exempt of. It’s individual countries doing it.

And on top of that the laws are different from what I’ve seen, in the UK for example you have to fullfil certain criteria to fall under that law. But frankly it seems to be a mess in my opinion.

This is what an age verification service says about it:

https://www.yoti.com/blog/understanding-age-verification-online-safety-act/