Types of early-onset Alzheimer’s disease. Most types of early-onset Alzheimer’s disease are the same, but there are a few small distinctions: Common Alzheimer’s disease. The majority of people with early-onset Alzheimer’s disease have the common form of Alzheimer’s disease.The disease will progress in roughly the same way as it does in older people with Alzheimer’s disease.Genetic Alzheimer’s disease.ypes of early-onset Alzheimer’s disease. Most types of early-onset Alzheimer’s disease are the same, but there are a few small distinctions: Common Alzheimer’s disease. The majority of people with early-onset Alzheimer’s disease have the common form of Alzheimer’s disease.