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Istituto Superiore di Sanità
EpiCentro - Epidemiology for public health
Epidemiology for public health - ISS

Dementia is a condition affecting between 1% and 5% of adults over 65 years old, and its prevalence doubles with every four-year increment in age, reaching about 30% by 80 years of age. Dementia is actually a general term used to describe several chronic and progressive conditions affecting brain functions and leading to cognitive decline. These are usually classified into two categories: “primary dementia”, such as Alzheimer’s disease, dementia with Lewy bodies and frontotemporal dementia, and “secondary dementia” (i.e. occurring as a result of other conditions), such as HIV-associated dementia.


The most common identified types of dementia include:

  • Alzheimer’s disease
  • Parkinson’s disease dementia
  • Creutzfeldt-Jakob disease
  • Vascular dementia
  • Dementia with Lewy bodies
  • Frontotemporal dementia
  • Progressive supranuclear palsy.


Publication date: 15 January 2021