[Some problems associated with aging].
D000368:Aged; D000375:Aging; D004381:Duodenal Ulcer / Q000453:epidemiology; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D007564:Japan; D008017:Life Expectancy; D008136:Longevity; D008297:Male; D013274:Stomach Neoplasms / Q000453:epidemiology; D013276:Stomach Ulcer / Q000453:epidemiology