I disagree. Children deserve a lot of protection, and anybody can become a parent. A lot of people are far too bad at parenting to leave the decisions to them completely. Some intervention is needed.
Saying that video games is outside the jurisdiction of the government is NOT saying there needs to be no guard rails.
Further more, yes. There are a lot of bad parents. The people who would be installed as the benevolent parental decision makers for society would be the worst of all.
Although I have no doubt someone will show up and say that should be left up to parents too.
Even the US already does far more than that, like making alcohol illegal for minors.