© Anatomical Travelogue/Science Source https://www.sciencesource.com/archive/Risks-of-Alzheimer-s-Disease-SS2857661.html Animation showing a 3D visualization of a brain, skull, and cerebral vessels taken from human scanned data. The narrator of this clip details the risks of Alzheimer's disease. Age is the number one risk for Alzheimer's. Genetics, head trauma, or stroke can also play a large part in the likelihood of the disease.