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What is the reduced flow of blood to the brain and older people primarily due to?

According to the National Institute of Neurological Disorders and Stroke (NINDS), intracranial atherosclerotic disease is one of the main causes of stroke and is caused by plaque buildup in the arteries of the brain. It is a key reason for the reduced flow of blood to the brain and older people primarily due to age-related changes in the vascular system.