Most people are diagnosed around 60. Anybody who gets it before 50 has a form that is considered "Young Onset PD"

source: http://www.parkinson.org/Parkinson-s-Disease/Young-Onset-Par...

My thoughts as well. I figure smoking will kill a large proportion well before they hit the age range in which Parkinson's sets in

My grandmother smoker her whole life and got Parkinson's at around 85. She died at 91 from smoking-induced stomach cancer.

My dad was diagnosed at 47