The appearance of the small bowel mucosa in old age.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D006801:Humans; D007413:Intestinal Mucosa / Q000033:anatomy & histology*; D007583:Jejunum / Q000033:anatomy & histology*; D008875:Middle Aged