Alzheimer's disease (AD) is a degenerative brain disease that involves dysfunction and loss of nerve cells in the central nervous system, was discovered by a doctor German, Dr. Alois Alzheimer in 1907. accounted for 50-75% of all cases of dementia, it is the most common form of dementia (Blennow et al., 2006) and is known as a progressive neuropsychiatric disorder which involves memory loss, mood swings and loss of intellectual and social activity. (Lee et al., 2010) and the patient will progress through the seven stages of Alzheimer's disease, but at different rates (Reisberg et al., 2003). The prevalence of dementia increases exponentially with age from 60 to 85 years or older, which is