That would only be true in Korea if you were still using the original lunisolar Korean calendar where the lunar years are shorter than the solar years so your age in lunar years would be higher. Same would go if you were using the lunar calendar in Japan. However, both Japan and Korea switched to the Gregorian calendar that we use in the late 1800s so normally you wouldn't calculate your age like that anymore. The lunar calendar is still used to calculate the dates for certain holidays in Korea though.
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