In the case of Alzheimer's, we know that, once a patient receives their initial diagnosis—say, at stage two—they die within eight to 10 years. Patients who do not die from the disease directly tend to die from complications such as pneumonia, sores and undernutrition. Once a patient reaches stage four, statistics show that their life expectancy is usually three to five years. Obviously, it varies, but that is the average. That's what the literature and clinical practice has taught us.
On November 3rd, 2020. See this statement in context.