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 series: Jonathan Keller — view on Vimeo

Cognition[edit]

For more information, see: cognition.

Normal aging[edit]

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]

Dementia[edit]

For more information, see: dementia.

References[edit]

↑ Anonymous (2025), Aging (biology) (English). Medical Subject Headings. U.S. National Library of Medicine.
↑ 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]
↑ 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
↑ 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.

[1] Anonymous (2025), Aging (biology) (English). Medical Subject Headings. U.S. National Library of Medicine.

[pmid14962147-2] 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]

[pmid9598672-3] 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

[pmid17322135-4] 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.

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