dementia
a chronic or persistent disorder of the mental processes caused by brain disease or injury and marked by memory disorders, personality changes, and impaired reasoning.
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Alzheimer's disease
the progressive mental deterioration that can occur in middle or old age, due to generalized degeneration of the brain. It is the most common cause of premature senility.
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senile
a person having or showing the weaknesses or diseases of old age, especially a loss of mental faculties.
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