Ancient Greece was a civilization centred around the Greek peninsula, that lasted from the 8th century BC to the end of the classical antiquity era (ca. 600 AD).

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What is the historical reason for 18 years being the most popular age of adulthood?

Most countries define the age of adulthood at 18 years. Why is this? Was there some historical precedent set in ancient rome/greece or something like that? Why 18 years and not some "nicer" number ...