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Why is age 18 used to demarcate children from adults?

Asked by gamefu91 (588 points ) January 6th, 2011

Why the age 18 is selected for demarcation?
Is their something special about being 18?
Why is it that one has to be at least 18 to do things like driving,voting,getting alcoholic beverages,sex,marriage etc. ? Can’t a 17 year old drive? Also some countries don’t punish criminal under the age 18,a 17 year old understand very well what is wrong and what is right. And why is it not uniform like for something one should be 21 at one place but an 18 year old could the same thing at some other place or even under 18?

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