<< This is a popular Venn Diagram, and a good starting point I feel, for the breakdown of different political concepts as discussed above: https://danieljmitchell.files.wordpress.com/2014/05/philosophical-circles.jpg” >>
Nice diagram, thanks!
It seems that Voluntarism is equivalent to Anarcho-Capitalism?
<< Look into these classifications as a base line. Then your question exists in several different shades of Libertarian thought, and even beyond.>>
I don’t think there are really so many shades. Either the answer is trivially easy to answer (assuming Minarchism or worse, wherein a community can simply decide on an arbitrary “age of responsibility”) or intractable, such as with Voluntarism.