Total population...................................... 17,990,455 SEX Male..................................................... 8,625,673 Female................................................... 9,364,782 AGE Under 5 years............................................ 1,255,764 5 to 17 years............................................ 3,003,785 18 to 20 years........................................... 839,066 21 to 24 years........................................... 1,114,358 25 to 44 years........................................... 5,862,873 45 to 54 years........................................... 1,913,920 55 to 59 years........................................... 811,857 60 to 64 years........................................... 825,110 65 to 74 years........................................... 1,348,279 75 to 84 years........................................... 767,270 85 years and over........................................ 248,173 Median age............................................... 33.9 Under 18 years.............................................. 4,259,549 Percent of total population.............................. 23.7 65 years and over........................................... 2,363,722 Percent of total population.............................. 13.1 HOUSEHOLDS BY TYPE Total households............................................ 6,639,322 Family households (families)............................. 4,489,312 Married-couple families............................... 3,315,845 Percent of total households........................ 49.9 Other family, male householder........................ 254,201 Other family, female householder...................... 919,266 Nonfamily households..................................... 2,150,010 Percent of total households........................ 32.4 Householder living alone.............................. 1,806,263 Householder 65 years and over...................... 700,016 Persons living in households............................. 17,445,190 Persons per household.................................... 2.63 GROUP QUARTERS Persons living in group quarters......................... 545,265 Institutionalized persons............................. 267,122 Other persons in group quarters....................... 278,143 RACE AND HISPANIC ORIGIN White.................................................... 13,385,255 Black.................................................... 2,859,055 Percent of total population........................... 15.9 American Indian, Eskimo, or Aleut........................ 62,651 Percent of total population........................... 0.3 Asian or Pacific Islander................................ 693,760