At what age does the ‘libertarian’ suggest that it should be legal to choose to sell their body?
No idea. I choose to think about other things actually. However, to suggest that Libertarians approve of child slavery, as your buddy’s tiresome post on threads like this does, is stupid, immoral and wrong.
Please keep in mind that libertarians can’t agree on anything. As a libertarian I have no problem with a moral compunction in human society.
And the selling of one’s body at any age is in fact morally degrading to all involved.
Of course that’s not a souless libertarian position but some do advocate it wholeheartedly regardless.