Aging country, aging world.
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D001723:Birth Rate / Q000639:trends; D004046:Dietetics; D005260:Female; D005853:Geriatrics / Q000706:statistics & numerical data / Q000639:trends*; D006801:Humans; D008017:Life Expectancy; D008297:Male; D009747:Nutritional Physiological Phenomena; D011157:Population Dynamics; D014481:United States; D047789:World War II