Hi @timerdude - I'm 68 and I've had two TKRs - one a couple of years ago and one in January of this year. I asked my doctor the same question and he said I would be 101 before I need another one! Later I was talking to my physical therapist and he said that years ago they only lasted about 15 years, but with the newer technology they were good for 30 years or so. He also said that if they do wear out, the worn part is the "plastic" padding between the metal. The metal doesn't wear out. He said that if it needs to be replaced it's just a matter of replacing the worn part - not getting a whole new knee. (His dad was a golfer and he had had a knee replacement years ago that needed more surgery because it "wore out.") Anyway, having said that, I would definitely encourage you to ask your surgeon. I'm curious, do you have pain, or just the squeaking?