The point in a distribution of household incomes at which half of the incomes
are below that amount, and half are above it, or the average of the two middle
incomes if there is no one middle income. Household income encompasses all persons
15 years or older in the household, regardless if the individuals are related
to one another. Income includes wages and salaries, self-employment, interest,
rentals and dividends, social security, public assistance, retirement, and
disability. Since many households consist of only one person, average household
income is usually less than average family income.