People responding to this are right about their actual intentions, but yeah. I think if you wanted to go about doing this the right way it would be an "I'm an adult" or a "this device is primarily used by a child" checkmark that could be locked down behind an administrative password.
That's it. That’s all you really need if your intention was actually just makeing sure kids couldn't wander into a part of the internet not made for them. Everything else, verification, that's just surveillance bullshit being bolted on top.