What is the starting age for Alzheimer's disease?

Most cases of Alzheimer's disease are diagnosed over the age of 65; however, there is also early-onset Alzheimer's. These cases make up only about 5 percent of all cases and may be diagnosed as early as 30 to 40 years of age, but closer to 50 years is more common.
When we learn that a family member or friend has been diagnosed with Alzheimer’s disease, many of us may assume that they are in their 70s or 80s. While the majority of people with Alzheimer’s are 65 and older, up to 5 percent of Americans with the disease begin to experience symptoms in their 50s or even their 40s. This is known as early-onset Alzheimer’s, and it is becoming more prevalent.
Sarine Salama
Sarine Salama on behalf of MDLIVE
Alzheimer's disease typically starts by age 65 or later. We are currently seeing a trend of Alzheimer's disease being diagnosed before the age of 65 and this is called Early Onset Alzheimer's disease

A brain disease that cripples the brain's nerve cells over time and destroys memory and learning. It usually starts in late middle age or old age and gets worse over time. Symptoms include loss of memory, confusion, problems in thinking, and changes in language, behavior, and personality.

This answer is based on source information from the National Women's Health Information Center.

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