Depends on type: Dementia is an umbrella term for anything that causes disability related to cognition. There are many causes of dementia, including neurodegenerative diseases, strokes, and even infections. Neurodegenerative diseases (e.g., alzheimer's) usually start in adulthood. Strokes that cause dementia ("e.g., vascular dementia") also occur in adulthood. Infections can occur at any point.
Answered 5/21/2016
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