Be careful about telling parents to parent. For some reason people do not like being told that it is the parents' job, and not the Government's.
How does that work? I don’t have a kid but can imagine a ban on internet until they are 18 might not work.
I’m not suggesting a government ban. Android, iOS, Macs and Windows all have parental controls built in that allow parents to block access to websites, installing apps, etc.