I wonder how difficult it would be to convince people that children only need access to certain sites, like wikipedia, encyclopedia brittanica, wolfram alpha, e

I wonder how difficult it would be to convince people that children only need access to certain sites, like wikipedia, encyclopedia brittanica, wolfram alpha, etc., and that you need to reach a certain age to get access to the wider internet. Even if it's not something enforced, it would be a nice social opinion.