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Countries in the East Asian cultural sphere have traditionally used specific methods of determining a person's age. Today, these methods see only limited use in certain contexts and areas, mainly in South Korea and Taiwan.
In China, where the system originated millennia ago, people are considered to be one year old at birth , and on New Year's Day of the lunar calendar, another year is added. That is, age is counted with ordinal numbers, not cardinal numbers; also, age is counted from the lunar new year, not from the date of birth.
South Koreans also use "year age", determined by the birth year and the current year. Eastern Mongolia has a different system for measuring a person's age, which is based on the number of lunar cycles that have passed since birth.