Ancient Rome was a civilization centred around the city of Rome, that lasted from the 8th century BC to 476 AD (West); 1453 AD (East).

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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 ...