So - at what point does the parent's responsibility turn from keeping the child safe, to allowing the child independence in things like sex, curfew, etc.?
15 is the age at which children are informally regarded as youths because they are, among other things, above the age of consent and criminal responsibility. As such, that is effectively the age at which the parents are required to allow their children significantly more autonomy.
It should be noted here that parents are allowed to interfere with their personal life if it's in the interests of their welfare and healthy development. If their child is hanging out with known delinquents and hoodlums, perhaps risking being dragged into petty crimes, their parents are of course allowed to try and stop them from doing so, as long as it's proportionate and does not constitute physical abuse.
The main problem is just that: it's very difficult to completely prevent a teenager, especially one aged 15 or older, from doing what they want without the kind of physical force and restraint that parents are not allowed to employ because it would be considered child abuse.
If they are 13 years old it's easier, but the principle is the same.
Edit: I should point out here that in pretty much all cases where children and youth engage in "socially degrading behavior", such as engaging in crime or otherwise socially unacceptable behaviour that is likely to have a significantly negative impact on their wellbeing and development, the social services are informed and may after an investigation seek involuntary actions if voluntary ones have no effect.
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