Before the Internet you had to work fairly hard to get a Playboy centerfold where the model just had her breasts out. Now you can effortlessly find endless depictions of anything, including the most depraved sex acts you can possibly imagine. The ease of access and breadth of content available to kids today makes it qualitatively different than when we were kids.

That does not, of course, mean that age verification laws are the appropriate solution. You could even argue that it's not a problem that kids have access to all this stuff (though I don't think I would agree with that). But you can't just hand wave it away by saying "we looked at porn on paper when we were kids". The situations are not at all the same.

The ease of access, quantity and diversity of internet porn is in no common measure with magazines that existed in the 20th century.