title: Changes in population profile by age.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005006:Ethnicity; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011153:Population; D011158:Population Growth; D012737:Sex Factors; D014481:United States