[Changes in the gastric mucosa in the aged].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002908:Chronic Disease; D005260:Female; D005745:Gastric Acidity Determination; D005753:Gastric Mucosa / Q000473:pathology*; D005756:Gastritis / Q000453:epidemiology; D006801:Humans; D007564:Japan; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D013276:Stomach Ulcer / Q000453:epidemiology