AD is the most common cause of dementia in all adults, including those < 65 years. It is responsible for 70%-80% of all cases of dementia and can be familial or occur sporadically. The second most common cause of dementia in individuals < 65 years is FTD. Most patients are diagnosed between ages 45-65 years. FTD also accounts for 25% of dementia cases in adults > 65 years. Although frequently missed diagnostically, Lewy body dementia is estimated to comprise at least 5% of dementia cases. The incidence of vascular dementia doubles every 5.3 years, increases with age, and accounts for approximately 15% of dementia cases in all adults.
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Cite this: Helmi L. Lutsep. Fast Five Quiz: Dementia Practice Essentials - Medscape - Mar 13, 2023.