"Court Rules in Pornhub’s Favor in Finding Texas Age-Verification Law Violates First Amendment Score one for Pornhub: A federal judge ruled Thursday that a Texas law requiring pornography sites to institute age-verification measures — and add prominent warning labels about the alleged dangers of porn — violates the U.S. Constitution’s First Amendment prohibition against free-speech restrictions..." https://variety.com/2023/digital/ne...w-violates-first-amendment-ruling-1235709902/
There is no effective way to do this. "Are you an adult yes/no?" or "Enter you birthdate"... any number will do... Yeah, no. It just doesn't work.
Currently not However, electronic devices are usually given and can be configured by parent or other legal guardian to children. Big Tech (plus major browser companies) could develop some standard that signals underage user is using device. https://www.compsmag.com/news/pornhub-seeks-aid-from-big-tech-to-comply-with-age-verification-laws/ Think of enterprise SSO - you don't use passwords for most network services at big companies, because your laptop is already signed in to some Azure AD It would be by no means bulletproof against highly-motivated teenager, but it could protect against accidental exposure to younger kids
