What groups of people typically get Parkinson's disease?

Some risk factors. Very rarely genetic in a few families, can be associated with multiple small strokes, can mostly be sporadic, seen after multiple head injuries (with/without dementia), seen after carbon monoxide poisoning, associated with manganese mining, maybe from carbon disulfide poisoning, rarely after oxygen deprivation. Most cases by far arise spontaneously, and affect males 3;1 females.