I have read that the rate of progression varies with both of these conditions. My dad has Alzheimer’s and it’s gone very slow. After at least 12 years and he still has periods of time that you can hardly tell.

Ref. Parkinson’s….i’m not familiar with it. I knew someone who had been diagnosed many years ago, but haven’t seen him in years. I sometimes wonder how he is doing. He seemed to be working after 15 years after diagnosis. Does it ever take a pause?