As a former police officer, maybe you are aware that the majority of crimes committed by minors occurs from roughly 3pm to 6pm. Why not a curfew then?
Telling people they must be off the streets when they're not doing anything wrong is a prescription for a police state. If you encounter someone actually breaking the law, cite or arrest them.
Otherwise, it's none of your business, no matter what their age. Minority Report indeed.
In this case, that is akin to suggesting that children of any age should be able to drive a car or carry a concealed weapon. After all, the law should only do something about it if and when they break the law, right?
The rights of youth are curtailed for good reason. Many centuries of experience in our culture has lead to this situation. It isn't some insidious police-state trying to take over the planet, it's responsible adults -- voters --proactively reining in kids who aren't being appropriately limited, for whatever reason, by their parents.
There is such a thing as unfettered liberty; it's called anarchy. The majority of US citizens don't want that.