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

18 is the age when everyone is fully out of puberty and the age when mandatory education is finished.

That’s the legality of being an adult, but it can be different culturally. For example, girls become women on their 15th birthday for Hispanics who celebrate Quinceaneras. Religiously, Jews celebrate Bat Mitzvahs as a transition into adulthood at like ~13.

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