With a hamster of this age we find it quite usual for them to start drinking and weeing a lot more hamsterman. The kidneys become less efficient and they process more water through them to get rid of the waste. If he had cushings he would likely be showing a lot of fur loss by now. There is an article on Cushings in the Wiki. I personally would not remove any of the bits from the Harry unless you have tested his urine and found it positive for sugar. They enjoy the bits you are taking out. An oldie in our hamstery gets the normal food plus hamster porridge made with readybek, wheatgerm, lactol and debittered brewers yeast twice or thrice a week. Also some babyfood occasionally, cooked pasta, veg and rice, egg and chicken when we have it and fresh fruit or veg in small amounts 3 times a week. When they get to this age we like to spoil them and let them enjoy their food. I hope he is well and still active and enjoying his dinner for a long while to come