Well i will hazard a guess fwiw. My mother was a narcissist. I am thinking about how she reacted when she was ill and disabled for a long time. A narcissist likely is deeply ashamed of whatever losses in ability he has suffered, and would not want attention brought to them. On the other hand a narcissist might relish getting a lot of extra attention and special things done for him. The trick to getting along with my mother was for her to believe that we did stuff for her because she was special.not because she was impaired.