In this study we are proposing to study how high levels of day-to-day stress and our body’s response to stress are related to memory and the risk of Alzheimer’s disease. We plan to interview individuals with and without memory difficulties and measure their level of stress as well as their reaction to stressful events. If we identify that stress is related to memory or to the risk of Alzheimer’s disease, this could lead to research to improve memory or decrease the risk of Alzheimer’s disease.