月げつ齢れい

noun

age of the Moon; lunar age

Technical term for the number of days since the last new moon, used in astronomy and traditional calendars.

• 今こん夜やの月げつ齢れいは14.5で、ほぼ満まん月げつです。

  Tonight's lunar age is 14.5, so it's almost a full moon.

noun

age in months

Used for stating the age of infants or young children in months, often in medical or childcare contexts.