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So you don't mean age declaration "please insert your date of birth to access this page" type, but the government ID type?
Efficacy, risks and invasiveness are all related to justification imo.
Here's one that compares each model and rates them: https://edri.org/wp-content/uploads/2023/10/Online-age-verification-and-childrens-rights-EDRi-position-paper.pdf
Is that similar to what you're looking for?
But your Efficacy, risks and invasiveness, are predicated on the need. If there is no need, the secondary discussion becomes redundant.
And I'm not saying there isn't a need, but I would like evidence to support the need.
Ah, so more like this? https://acpeds.org/position-statements/the-impact-of-pornography-on-children
Yes like that. I'll have to dive into the sources presented.