What is the youngest person known to have Alzheimer's disease?
It is very rare to show signs of dementia before age 40, however the youngest person ever diagnosed with Alzheimer's was 27 years of age. Alzheimer's and Down's Syndrome are both on chromosome 21, and patients who have Down's Syndrome invariably develop Alzheimer's if they live long enough. Other dementia and disease-like symptoms can overlap with Alzheimer's, so a patient may be diagnosed with different forms of illnesses at the same time.
Some people start showing signs of Alzheimers in their 30's but for someone to be diagnosed with it is usually in their 50-60 years old. As for the youngest person diagnosed with it , I don't know. Check out WEBMD to see if it will tell you.
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