Aging (biology)

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This editable Main Article is under development and subject to a disclaimer.

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

## Contents

* 1 Cognition
* 1.1 Normal aging
* 1.2 Dementia
* 2 References

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]

1. ↑ Anonymous (2025), 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.