Research on cognitive aging is becoming increasingly common because aging is a global phenomenon and brings with it many challenges, for example, the increased incidence of dementias such as Alzheimer’s Disease (AD). Even if the cognitive decline in AD is apparently linear, impairment of autonomy in activities of daily living does not follow the same pattern. Objectives: To monitor and evaluate the cognitive aspects of elderly diagnosed with Alzheimer’s disease. Methodological procedures: This research was conducted from January 2006 to July 2013 at the Clinic of Geriatrics and Gerontology. Longitudinal study of 51 elderly patients aged 60 years, of both sexes who received a diagnosis of Alzheimer’s disease by DSM-IV (APA, 1994) and NINDS-ADRDA (McKhann et al., 2011). Results: From the results obtained in the present study, we observed that the participants had a decline in cognitive function from the first to the second assessment, even with drug treatment.