My father has had diabetes for a very long time (decades). He's now 66 years old, and has 7% Kidney function. He goes to all his doctor's appointments, takes a whole mess of meds, and occasionally works out (when forced..). Despite all this, I know he'll eventually need a kidney transplant, and being his only child I may be a match for that. However, my sisters (we have different fathers) insist that he will just go through the kidney too quickly, and that there's no point.