title: Fit middle aged adults have a lower risk of dementia.
mesh_terms: D000367:Age Factors; D000368:Aged; D003704:Dementia / Q000453:epidemiology* / Q000517:prevention & control*; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D010353:Patient Education as Topic / Q000379:methods*; D010809:Physical Fitness; D012307:Risk Factors; D014481:United States / Q000453:epidemiology