The guy is pretty old, he has diabetes and has to sit all the time.
Also his guitar playing has always been minimalistic. Basically and exclamation point on his vocals. That isn\'t to say that he can\'t jam but his style is more about emphasizing his vocals IMHO.
He is a legend and be glad you were able to see him before you can\'t.
I\'m still bummed I never got to a Ray Charles show.