I agree, letting parents do their job of parenting is the best way to deal with this. But the problem is that that's very difficult, and they currently lack adequate tools.

The best method would be to make sure operating systems support parental controls that parents can set, and require websites to respect those settings (and browsers to support an API passthrough of the OS setting). That way there's no need to do any age verification that sends sensitive data like ID or faces to third-parties with sketchy privacy policies.

Unfortunately, when moves were actually taken to implement this kind of solution, reactionaries pushed back and made sure it didn't happen.