Yep, and some people exposed to "Crop dusting" show Parkinson-like symptoms as well.

When failure to initiate (aphasia?) sets in, Please be kind and just wait. Parkinson's proceeds by plateau, decline, plateau, decline. Ever downward, with brief periods of stability.
You learn a lot in 14 years, and for my wife, almost 20 solid.

It will make you a better man if you let it.

Out there doing it best I can.