Alzheimer's generally occurs in people who are aged 65 and older. However, younger individuals can also develop Alzheimer's. The three main types of Alzheimer's are:
Early-onset Alzheimer's: This form of Alzheimer’s affects people less than 65 years of age (generally people in their 30s to 50s). It makes up less than 5% of all Alzheimer's cases.
Late-onset Alzheimer's: It is the most common form of Alzheimer's and occurs in people 65 years and older. This disease typically arises from a combination of changes (and risk factors) that happen over time.
Familial Alzheimer’s Disease (FAD): It is a form of Alzheimer’s (which makes up less than 1% of all cases), and doctors have linked it to genetics. At least two generations within a family are affected by this disease.