"Count the Levites by their families and clans. Count every male a month old or more." (NIV)
Number the sons of Levi by their fathers' houses and by families. Every male from a month old and upward you shall number. (AMP)
Number the children of Levi after the house of their fathers, by their families: every male from a month old and upward shalt thou number them. (KJV)