Alzheimer's is a progressively degenerative disease that affects the brain, gradually impairing brain function. It is the most common cause of dementia -- impairment of cognitive skills -- among older people, affecting an estimated 5.1 million Americans. Memory loss is one of its most prominent effects, often the first noticeable symptom of the disease. Here, we'll explore Alzheimer's impact on memory, and how those changes affect the daily lives of Alzheimer's sufferers.