<unk> , also called younger-onset Alzheimer's, is Alzheimer's<unk>  diagnosed before the age of 65. It is an uncommon form of Alzheimer's, accounting for only 5–10% of all Alzheimer's cases. About 60% have a positive family history of Alzheimer's and 13% of them are inherited in an autosomal dominant manner. Most cases of<unk><unk>  Alzheimer's share the same traits as the "late-onset" form and are not caused by known genetic mutations. Little is understood about how it starts. Non-familial<unk><unk>  AD can develop in people who are in their 30s or 40s, but this is extremely rare, and mostly people in their 50s or<unk>  60s are affected.
Early-onset Alzheimer's disease
Vascular dementia
Depression of Alzheimer disease
Subcortical dementia
Lewy body dementias
Low pressure hydrocephalus
Parkinson's disease dementia
Alcohol-related dementia