Certain things make getting a disease more likely. These are called risk factors. Risk factors for Alzheimer's disease include:
- Getting older. This is the main risk factor. People rarely have dementia before age 60.
- A family history of Alzheimer's disease, especially if one or more of your parents or siblings has the disease.
- The presence of the apolipoprotein E-4 gene.
- Having Down syndrome.
- Injuries to the brain, especially more than one injury that caused you to pass out (such as a concussion from a fall, car accident, or playing a sport.)