I want age verification but not at the OS level.

Yes, let me send a picture of my ID to every app on the internet. That's so much better than having the device I own attest to my age anonymously.

> I want age verification

Why?

What would a world with your preferred age verification system look like?

I want reverse age verification that lists the ages of every social network post. I think a lot of people that criticize social network toxicity don't realize their interlocutors are half their age. It's not one-to-one, meaning maturity doesn't follow from age, but I think there would be some affordances made in both directions. A younger person would be less surprised that a 60+ yr old would hold certain views. And vice versa.