The answer to how old are you depends on your culture and even social context within said culture. Isn't that weird?
When you're born, you're 0 years old and on your birthday, your age increases by 1.
In Japan, the old system was supplanted by the international counting method with the Nenrei Keisan ni Kansuru Houritsu (Age Calculation Law), passed in the Meiji Era, when Japan was becoming less like Japan and more like the West (TM).
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