Frontotemporal dementia (FTD) is a progressive brain disorder that affects the frontal and temporal lobes of the brain. These lobes are responsible for personality, behavior, and language. FTD typically occurs in people between the ages of 40 and 65, and it is estimated that about 50,000 to 60,000 people in the United States have the disease. FTD is a type of dementia, but it differs from other types of dementia, such as Alzheimer's disease, in several ways. One of the most significant d...