Later weddings, fewer children, more singles change U.S. family.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D008393:Marriage; D012847:Single Person; D012922:Social Change; D014481:United States