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

Girls had to assist in caring for the elderly, including men suffering from senile dementia.

From BBC

I was uncertain if this referred to Bud or to a literal blue jay, or if, perhaps, we were heading into the territory of senile dementia.

From Literature

Many suffered from senile dementia or other debilitating conditions, and the intent was to protect them from injury in accidental falls.

From Washington Post

Q. Do you recall him being diagnosed as having senile dementia in 1991?

From Washington Post

The late California Supreme Court Justice Marshall F. McComb was forced to retire in 1977 at the age of 82 after he was found to have “senile dementia.”

From Los Angeles Times