senile dementia

noun Pathology.
a syndrome of progressive, irreversible impairment of cognitive function, caused by organic factors and having its onset late in life.

Origin:
1850–55

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Collins
World English Dictionary
senile dementia
 
n
dementia starting in old age with no precipitating physical cause

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

senile dementia n.
A progressive, abnormally accelerated deterioration of mental faculties and emotional stability in old age, occurring especially in alzheimer's disease.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Senile dementia has been around for as long as people have had the means of recording it.
He had a history of hypertension, mild senile dementia, and depression.
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