For statistical reporting purposes, a classification that defines one and only one person in each housing unit as the head. Head of household implies that the person rents or owns (or is in the process of buying) the housing unit. The head of household must be at least age 18, unless all members of the household are under age 18 or the head is married to someone age 18 or older. (https://www.bjs.gov/index.cfm?ty=tda)