日にち齢れい

noun

age in days; number of days old

Used in technical or formal contexts such as animal husbandry, medicine, or record-keeping to specify age in days.

• このヒナの日にち齢れいは3日にちです。

  This chick is 3 days old.

• 日にち齢れい計けい算さんは新しん生せい児じの健けん康こう管かん理りに重じゅう要ようだ。

  Calculating age in days is important for newborn health management.