Definition of senile dementia noun from the Oxford Advanced Learner's Dictionary

 

senile dementia

 noun
noun
BrE
 
; NAmE
 
[uncountable] Mental and emotional problems, Old age
 
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a serious mental disorder in old people that causes loss of memory, loss of control of the body, etc. See related entries: Mental and emotional problems, Old age
See the Oxford Advanced American Dictionary entry: senile dementia