(かぞ)(どし)

かぞえどし
noun
traditional age counting; East Asian age reckoning
culturetime-general
1. traditional age counting; East Asian age reckoning
A traditional system of counting age in which a person is one year old at birth and gains a year every New Year's Day, rather than on their birthday.
(かぞ)(どし)今年(ことし)三十歳(さんじゅっさい)だ。
In traditional age counting, I am thirty this year.
Some families celebrate Shichi-Go-San based on traditional age counting.
In the past, traditional age counting was common, but now the Western system is used.

Under this system, a baby is considered one year old (一歳(いっさい)) at birth, and everyone becomes one year older on January 1st (originally based on the lunar new year). This means a person born on December 31st would be considered two years old on the following day.

Common collocations

Similar words

Cultural note

Japan officially switched to the Western age system (満年齢(まんねんれい)) in 1950, but (かぞ)(どし) is still used for some traditional events like 厄年(やくどし) (unlucky years) and 還暦(かんれき) (60th birthday celebration).