I'm not a boomer. I developed a social media platform (we called it web 2.0 then) in 2007. I understand social media so well I had stopped using it by 2014, as had almost all my contemporaries.
The thing to lock up is the phones, not the websites. Phones for children need a governor and this is certainly technically possible. Jailbreaking a governed phone is also possible, and you'd have to make that illegal for under 18s and take it very seriously, but it actually is both technically possible and enforceable to do this.
Putting photo id on websites is a transparent bid to control speech, and I would vote against it. But that's just one proposed method. There are numerous possible ways to protect children. I really believe we need to start thinking of them, and not let this problem be used as a trojan horse to sneak in speech controls or political suppression of adults.