East Asian age reckoning

Traditional age reckoning in East Asia

Traditional East Asian age reckoning covers a group of related methods for reckoning human ages practiced in the East Asian cultural sphere, where age is the number of calendar years in which a person has been alive; it starts at 1 at birth and increases at each New Year. Ages calculated this way are always 1 or 2 years greater than ages that start with 0 at birth and increase at each birthday. Historical records from China, Japan, Korea, and Vietnam have usually been based on these methods, whose specific details have varied over time and by place. The South Korean government switched to the international system on June 28, 2023.

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