My dad has polymyalgia and he has also used prednisone for many years. They tried to take him off the prednisone a year or two ago but he cannot find anything else to help to manage the symptoms as well so he made them put him back on it. He is in his 70's and has had some other health issues especially heart related and had a mild stroke recently. But even with all that he manages to be in relatively good health and is very active and does a ton of exercise (like half marathons four time a year).