The majority of cases are primary<unk> . Incidence is estimated to 0.3–3% in patients older than 60 years and raising with older age Its prevalence is reported to be less than 1% in persons under the age of 65, and up to 3% for persons aged 65 or older. No difference in incidence is seen between men and women. Among individuals with dementia, the incidence of<unk>  is thought to be between 2 and 6%.
Normal pressure hydrocephalus
Low pressure hydrocephalus
Lewy body dementias
Early-onset Alzheimer's disease
Multiple system atrophy
Frontotemporal dementia
Vascular dementia
Dementia with Lewy bodies