I might be able to begin. Very quickly, I'd refer you again to the Council of Canadian Academies' report because it overviews those jurisdictions.
In the Netherlands, for instance—to your earlier question, Monsieur Thériault—if you're between 12 and 16, parental consent is required. If you're between 16 and 18, the parents must be consulted but they don't have a veto. I hope that answers your earlier question, but generally I'd refer you back to that report as a starting point.