Approximately what percentage of U.S. women age 90 or older likely have dementia?

The correct answer is based on studies indicating that the prevalence of dementia among women aged 90 and older is approximately 40%. This statistic highlights the significant risk of dementia that increases with age, particularly in women, who tend to live longer than men. Age is a critical factor, as neurodegenerative diseases such as Alzheimer’s are more common in older populations. Therefore, the 40% figure reflects the realities of aging and its associated health challenges, emphasizing the importance of understanding and addressing dementia in elderly care settings.

While options indicating other percentages may suggest varying levels of dementia prevalence, the most current statistics identify that around 40% is the most substantiated figure for this specific age group, making it the most accurate choice.