The average diagnosis age for Parkinson’s disease in the U.S. is 70.5 years.
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. 2003; 157(11): 1015-22. http://aje.oxfordjournals.org/cgi/content/full/157/11/1015