senile dementia

American  

noun

Pathology.

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

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senile dementia British  

noun

1. dementia starting in old age with no precipitating physical cause

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Etymology

Origin of senile dementia

First recorded in 1850–55

Example Sentences

Senile dementia is the result of old age and of acquired brain disease.

From Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada by Ritter, Thomas Jefferson

Senile dementia had already laid its spectral clutch upon my wizened cerebellum when I was rescued by some kindly people, who tell me that they found me scorching down Hays Hill on a cushion-tired ordinary.

From The War of the Wenuses by Graves, Charles L. (Charles Larcom)