He explains the details in his book, https://jonathanhaidt.com/anxious-generation/ https://jonathanhaidt.com/anxious-generation/, but I think the gist of it is

He explains the details in his book, https://jonathanhaidt.com/anxious-generation/ https://jonathanhaidt.com/anxious-generation/, but I think the gist of it is that his recommendations are reasonable and actionable. Below age 16 it seems quite possible, policy-wise and parent-wise, to keep kids off social media. But the older they get the more they would push back (being teenagers after all). Saying something like "no social media until 25" would immediately have people discount Haidt's rational policy solutions as something not practically achievable, never mind probably not legal either.