数かぞえ年どし

noun

East Asian age reckoning; traditional age counting

Refers to the traditional system where a person is considered one year old at birth and gains a year on New Year's Day, rather than on their birthday.

• 日本にほんでは、昔むかしは数かぞえ年どしで年ねん齢れいを数かぞえていました。

  In Japan, people used to count their age by the traditional East Asian age reckoning system.

• 数かぞえ年どしでは、生うまれたときが一いっ歳さいで、正しょう月がつが来くるとみんな一ひとつ年としを取とります。

  Under the traditional age reckoning, you are one year old at birth, and everyone gains a year when New Year's Day arrives.