I am 54 and have had both hips and both knees replaced ( 3 weeks post op on my left knee replacement). I just would like to let you know that the first two weeks you're going to have all kinds of different pain. Actually you're going to probably have it occasionally after a certain time, but the first two weeks are the toughest weeks. You' going to have to be patient. Do a lot of icing and rest and good luck to you.