In almost all countries (I know there are exceptions), the age for allowing drinking, marriage, driving etc. are commonly 18/21. Why didn’t they go for a round figure number like 20? Is there any biological or psychological reason behind this that I’m not aware of?
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21 is not a global number, 18 might be.
And 18 has some origins in jewish religious rules and became popular in the west and with that the whole world in modern history.
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