AL.com | What is early onset dementia, Alzheimer's type? Disease claims legendary basketball coach Pat Summitt AL.com According to the Alzheimer's Association, youngest onset, or early onset, dementia Alzheimer's type affects people younger than age 65. Up to 5 percent of the more than 5 million Americans with Alzheimer's have younger-onset versions of the disease ... Coach Pat Summitt's battle with Alzheimer's inspires many to fight Pat Summitt Dead: Legendary Basketball Coach Dies At 64 After Battling Dementia Pat Summitt Dead: 5 Fast Facts You Need to Know |