Mayo Clinic Care Network Content
Articles

Young-onset Alzheimer's: When symptoms begin before age 65

What is young-onset Alzheimer's?

Young-onset (also called early-onset) Alzheimer's is an uncommon form of dementia that affects people younger than age 65. About 5% to 6% of people with Alzheimer's disease develop symptoms before age 65. So if 4 million Americans have Alzheimer's, around 200,000 to 240,000 people have the young-onset form of the disease.

Most people with young-onset Alzheimer's develop symptoms of the disease when they are between 30 and 60 years old.