There are two main types of dementia: Alzheimer’s disease and vascular dementia. Alzheimer’s disease increases with age and kills a person’s brain cells. Vascular dementia is caused by a series of strokes that occur in a person’s brain, which destroys brain cells and affects a senior’s behavior. Often times these strokes are so small that an elderly person does not realize they are even having a stroke. More examples of what causes dementia include head trauma, Lewy Body disease, Wernicke-Korsakoff syndrome, Huntington’s disease and Pick’s disease.