The incidence of Parkinson's disease rapidly increases over the age of 60 years--with only 4% of cases occurring under the age of 50.
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Van Den Eeden, Stephen K., Caroline M. Tanner, Allan L. Bernstein, Robin D. Fross, Amethyst Leimpeter, Daniel A. Bloch, and Lorene M. Nelson. "Incidence of Parkinson’s Disease: Variation by age, gender, and race/ethnicity". Am J Epidemiol. Vol. 157, No. 11, pp. 1015-22. [ Permalink ] |