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We evaluated the prevalence of dementia and mild cognitive impairment (MCI) in indigenous Tsimane and Moseten, who lead a subsistence lifestyle.    Methods  Participants from population‐based samples ≥ 60 years of age ( n  = 623) were assessed using adapted versions of the Modified Mini‐Mental State Examination, informant interview, longitudinal cognitive testing and brain computed tomography (CT) scans.    Results  Tsimane exhibited five cases of dementia (among  n  = 435; crude prevalence = 1.2%, 95% confidence interval [CI]: 0.4, 2.7); Moseten exhibited one case (among n = 169; crude prevalence = 0.6%, 95% CI: 0.0, 3.2), all age   ≥ 80 years. Age‐standardized MCI prevalence was 7.7% (95% CI: 5.2, 10.3) in Tsimane and 9.8% (95% CI: 4.9, 14.6) in Moseten. Cognitive impairment was associated with visuospatial impairments, parkinsonian symptoms, and vascular calcification in the basal ganglia.    Discussion  The prevalence of dementia in this cohort is among the lowest in the world. Widespread intracranial medial arterial calcifications suggest a previously unrecognized, non‐Alzheimer's disease (AD) dementia phenotype.

Prevalence of dementia and mild cognitive impairment in indigenous Bolivian forager‐horticulturalists