Parkinson's disease is the leading cause of dementia, and its rate rises from less than 4% of those age 65 to 74 to nearly half of those 85 years or older.

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Parkinson's disease is not the leading cause of dementia. Alzheimer's disease is the leading cause of dementia. Parkinson's disease can lead to Parkinson's dementia, but it is not the most common cause. Additionally, while the risk of Parkinson's disease does increase with age, it is not true that nearly half of those aged 85 or older will have the disease.

Parkinson's Disease Is the Leading Cause of Dementia, and Its