How long does it take for parkinson’s disease to cause you death?

My grandpa has had parkinson’s disease for a long time. 5 years ago, he was seemingly healthy, could walk and everything. And now, he cant walk, cant talk good, twicthing alot, and very thin. Im really worried that his time to drawing near. If anyone has had a family member with parkinsons, please let me know everything that happened.

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