my father suffered from Alzheimer's and he died after a prolonged illness involving chronic hypertension, diabetes, pneumonia and the relapse of it at the age of 64 after having been a brilliant scientist and profeesor of plant genetics for 31 years. He had a long history of hypertension which eventually resulted in vasculo basillar deficiency. He had a Ph.D in plant genetics from the university of Minnesota and was one of the pioneers of genetics in hyderabad , INDIA