Alzheimer's disease is the most common form of dementia. It is fatal and there is no cure. It starts slow and can end with severe brain damage. Age, family history, head trauma, and heart health are all contributing factors of Alzheimer's. Genetics play a very big role in an individual getting the disease. Head trauma is also a huge factor, for example you can get a concussion and in the long run end up getting Alzheimer's from a bleed in brain from the injury.