senile dementia

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

i>-Lat: insanity which occurs as the result of old age and is progressive in character; a progressive, incurable form of fixed insanity resulting in a total collapse of the mental faculties which, in its final state, necessarily deprives one of testamentary capacity. With that particular malady, the victim loses the power to think, reason, or act sanely. See competent; incompetency.

n.

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

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The noun has one meaning:

Meaning #1: dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease
  Synonym: senile psychosis

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