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What causes dementia in a 40 year old?: Understanding Early-Onset Dementia

While dementia is most commonly associated with older age, up to 9% of all dementia cases are considered young-onset, affecting individuals under the age of 65. Understanding what causes dementia in a 40 year old involves a complex mix of genetic predispositions, specific neurodegenerative diseases, and potentially reversible conditions that differ significantly from late-onset dementia.