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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18 is about the time when men stop getting physically taller.
In societies that relied very heavily on manual labor, that was a pretty big developmental milestone.
Some of those same societies actually marked 16 as the age of majority for women, for similar reasons. Which is still reflected in some laws and cultural views today.
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