How come the age for most things “adult” was decided to be 18 and/or 21 globally?

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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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Anonymous 0 Comments

This came from british academy of science around 200 years ago. The conducted huge research and found the safest age for a women to labot a child around 20 years. Than subtracted 2 years (1 for pregnancy, 1 for arrangements).

In same time to most mens (who can afford it) finished college around 18. Thus 18 became very convinient age to state adulthood.

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