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For sure someone’s social environment and personal choices are also huge factors when someone commits a crime. Still, the law does give lower sentences for minors, so maybe someone could still be considered a minor until the age of say, 21. Like you said I guess more research needs to be done.

Yes, that is true. But I am not very sure if the reason behind it is social rather than biological. Interesting topic. I will do some research about it and maybe create an article here.