'One month old' in the Bible

Those who were numbered of them, the males from one month old and over, were seven thousand, five hundred.

Those who were numbered of them, the males from one month old and over, were eight thousand, six hundred, who were responsible for the care of the holy place.

All the Levites numbered by Moses and Aaron at the order of the Lord, all the males of one month old and over numbered in the order of their families, were twenty-two thousand.

Of these, twenty-three thousand males, from one month old and over, were numbered: they were not numbered with the rest of the children of Israel, for they had no heritage among the children of Israel.