Rick
You’re right that I don’t buy the “social contract” thing, any more than I buy that inner-city protection rackets are “security services”.
Your second issue seems to center around the notion of age of consent. I’ll go with that assumption in answering you, and you can steer me back in if I veer.
(By the way, thanks for the thoughtful way you pose your questions — actually allowing me to answer first before you go further, and actually asking about a single, focused, common issue, rather than a bombardment of ridiculous hypotheticals about giant squids reclaiming their land and men who own all the water on earth.)
Libertarianly speaking, the definition of an adult is a person who is capable of giving meaningful consent. That means that children, people who are severely retarded, or people who are senile, etc., are not adults. But they are still rights bearing entities because God or nature gave them their original property: life.
The contract parents have with their child is unique in that they are the only consenting party; i.e., it is a unary contract. The child is therefore not bound to their contract, nor to the contract of their government, once he has achieved the ability to give meaningful consent.
Who decides when this has happened? His parents or guardians do, of course. (I’ll deal with incalcitrant parents shortly.) A consent age is meaningless. Some people are more mature at fifteen years of age than others are at fourty. Therefore, the parents will declare to their government that their child has become an adult whenever they see fit to do so.
At that moment, the man or woman is not a rights bearing entity whose voluntary consent is required before you may govern him. If you govern him without his consent, then your government has abandoned its libertarian context.
But what to do about parents who refuse ever to release their child from their custody? If the child believes that he has become able to give meaningful consent, and his parents refuse to declare his adulthood to your government, then he may challenge his parents in your arbitration system. Whatever system you employ, in order to be in a libertarian context, must provide a means to determine whether those it governs have freely consented. In your case, I believe you have chosen a contract system.
If your arbitration determines that the child is indeed an adult, then he is free, like any other human being, to join your collective or else secede from it. If your arbitration determines that he is not an adult, then he is returned to the custody of his parents. If he, on his own, disavows both your decision and theirs, then he may attempt to leave, taking with him no more property than he came into life with. (Yes, that means he must walk away naked if his parents will not let him have his clothes.) The reason you may not stop him from leaving is that he is not a “ward of the state”; he is the responsibility of his parents.
Note that it would do you no good to refuse to ever arbitrate on behalf of children who appeal to you because, since they cannot give consent, you cannot contract with them and therefore cannot derive any revenue from them.
Does this mean that, from time to time, there will be friction in families as parents and children (all parties behaving immaturely) battle over whether the child is a grown-up? Yes, probably. But this is a family matter, and not a matter for the government unless, as I said, the child believes that he is no longer a child and appeals to your arbitration to declare him an adult.
Knowing what little I do about you, I presume you are not going to contract with lunatic trash who abuse their children anyway, so squabbles like these should be rare. Most parents certainly love their children, and I presume you will enforce responsibility and accountability such that the framework of your society is a sober one, and not a Jerry Springer circus.
I imagine that you will have a slew of follow-up questions, but I only ask that you minimize them by thinking through some of them yourself first. Your good intellect will be able to answer most of them, I believe. Think, as you already have done, about how to apply the simple principle of noncoercion, and your answers will pop out at you like musical notes pop out to the trained eye.
Okay. Fire away.