All blessings to Mr. Diamond. I wouldn't wish that disease on my worst enemy. My Uncle left this vale because of it.
As far as the age thing goes, I liken it to polishing an old chunk of coal until it turns into a diamond someday. I'm 66 and still playing and I'm finally getting the hang of it after 50+ years. I can say more with less. It's all good.
I recently saw Buddy Guy and that old man can kick your ass. Better than ever.