Final answer:
Although the exact percentage of men and women 85 and older at risk for dementia is not specified, it is understood that Alzheimer's disease is a common cause of dementia and nearly half of people over 85 have some cognitive impairment, suggesting a high risk in this age group.
Step-by-step explanation:
The question is asking for the percentage of men and women 85 and older who are at risk for developing dementia. While the provided table does not specify the exact percentage for those 85 and older, it highlights various age groups and their respective percentages of dementia diagnosis. Given that Alzheimer's disease is the most common cause of dementia in the elderly and that roughly one in every eight people age 65 or older has the disease, we can infer that the risk increases significantly as people age. Furthermore, other health issues prevalent in the older population such as heart disease, cancer, and decreased immune system efficiency can contribute to the vulnerability to dementia. Taking into account that nearly half of those over the age of 85 years exhibit at least mild cognitive impairment, it's reasonable to conclude that the percentage at risk for developing dementia in this age group would be quite high, though a precise percentage requires more specific epidemiological data.