What content shouldn't children be accessing? Is the content a 7, 11 or 16 year old shouldn't access different between age brackets? Who makes that determination? Is this access restriction at the whole site level, or per-post? Does safe-harbor apply, or is a site-operator liable for age-inappropriate content it hosts for its clients? On S3, for example, is each object tagged with an age category, or would it have to be a totally separate S3, like GovCloud?