The purpose of REVEAL-SCAN is to understand how people respond to learning their risk of developing Alzheimer’s disease dementia. Each participant receives a personalized estimate of his or her risk of developing Alzheimer’s disease dementia by the age of 85. This risk is based on current age, race, gender, and family history of Alzheimer’s disease dementia. Participants will have amyloid neuroimaging, also known as an amyloid brain scan, or an amyloid PET scan. Adults ages 65 to 80 with no memory problems but a parent or sibling with Alzheimer’s disease dementia may be eligible.