Do lots of people get Parkinson's disease, or is it unusual?

Parkinson's disease. There are certain variables which affect the frequency of pd. Prevalence of pd (number of cases at a particular point in time) is thought to be about 0.3 percent in the general population, and about 1 percent in people over 60 (nussbaum et al, 2003; de lau et al, 2006). Worldwide, there are about five million people with Parkinson's disease (sherzer et al, 2007).