There's no reliable way to verify age without extensive face verification with liveliness checks. A child can easily upload a parent's or some other adult's id card photo to get 'verified'. Also nothing stops kids to explore porn corners of social media (including lemmy) and thousands of porn sites operated not by the Big Porn. Porn is fundamental to internet.
Edit: I purposefully omitted vpn, that being the most trivial solution.
That's all besides the point however.
If a young kid is motivated by highschool seniors to watch porn, it is s parenting issue. If some adult encourages some child to watch porn as a grooming technique that's a much more serious case of child abuse. If a teenager is porn addict and doesn't do anything else, it is a major mental health concern, not a porn concern itself.
It is kind of accepted fact that many late teenagers are familiar with porn and explore it like any other sexual aspects of their life. Whether that's harmful is upto debate but teenagers/adults do many things harmful everyday and banning everything with law isn't realistic either. It is not end of the world if a teenager has sex or watches a porn movie. Children have greater dangers in general where they get abused by their relatives, teachers and even by their own parents and are continuously attempted to be programmed not to critically think by the religions.
