Answer:
Alzheimer's disease.
Explanation:
Alzheimer's disease is a form of dementia that causes memory and behavioral problems. Alzheimer's disease is a chronic condition causing the degeneration of brain cells. The symptoms of Alzheimer generally develop slowly and get worse with passing time, and become serious enough to hinder everyday tasks. The biggest known risk factor is growing age, and the majority of people with Alzheimer's are over 65.