My Father is 89 years old and taking blood pressure medicine. We have been keeping him at home; however, lately his legs are becoming weaker and weaker. He is using a walker to go from bed to chair to bathroom, but now he cannot even do that. He previously was diagnosed with prostate cancer - a year a half ago decided to stop treating for this. He recently has complained about pain in his upper leg. We are going to take him in; however, wondering if weak legs would be sign of prostate cancer coming back or normal aging process. He eats but not a lot, in the last 5mths he has lost 15 lbs. Any thoughts?