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For individuals over 80, the life expectancy with vascular dementia typically ranges from 3 to 7 years after diagnosis, though it can vary depending on the severity of the condition and overall health. Vascular dementia, caused by reduced blood flow to the brain (often due to stroke or small vessel disease), can progress in a stepwise manner, with sudden declines in cognitive function followed by periods of stability. Factors such as the presence of heart disease, stroke history, and other medical conditions can influence life expectancy. Early diagnosis, proper management of cardiovascular health, and strong support systems can help improve both longevity and quality of life for individuals living with vascular dementia.