Aging (biology)

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This article is about Aging (biology). For other uses of the term Age , please see Age (disambiguation).

In biology, aging is defined as the "gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time."[1] {{#ev:vimeo|106228|275}} A series of photos, taken daily over the course of 8 years.

(CC) Photo seriesJonathan Kellerview on Vimeo


For more information, see: cognition.

Normal aging

Decline in executive control may occur with aging.[2] Loss of nonverbal skills, which can be measured by tests of clock drawing[3], may be especially important.[4]


For more information, see: dementia.


  1. Anonymous (2024), Aging (biology) (English). Medical Subject Headings. U.S. National Library of Medicine.
  2. Royall DR, Palmer R, Chiodo LK, Polk MJ (March 2004). "Declining executive control in normal aging predicts change in functional status: the Freedom House Study". J Am Geriatr Soc 52 (3): 346–52. PMID 14962147[e]
  3. Royall, D.; Cordes J.; & Polk M. (1998). "CLOX: an executive clock drawing task". J Neurol Neurosurg Psychiatry 64 (5): 588-94. PMID 9598672. Full text at PubMed Central Example form
  4. Royall DR, Chiodo LK, Mouton C, Polk MJ (March 2007). "Cognitive predictors of mortality in elderly retirees: results from the Freedom House study". Am J Geriatr Psychiatry 15 (3): 243–51. DOI:10.1097/01.JGP.0000240824.84867.02. PMID 17322135. Research Blogging.