D. Hypertension, diminished activity levels, and head injury increase the risk of dementia.
Even among those 85 and older, the majority of persons are not significantly affectedby dementia, whose primary characteristics include the gradual, progressive loss of memory, cognitive functioning, and decision-making abilities.
Although disorientation tends to result at some point in dementia, it is usually not the most dominant or fundamental feature of dementia.
Dementia develops insidiously, and most persons with it fail to notice its development and tend to minimize or conceal the presence of symptoms rather than complain or seek assistance.
Many factors can contribute to dementia in vulnerable persons, including diet, diminished physical and mental activity, and cardiovascular risk factors such as hypertension.
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