I change wedges out typically every 5-10 years. I am probably in the middle of that range now and am getting new 52 and 58 degree wedges. Two reasons. First, I just purchased Titleist T200 irons which increased the distance I hit the PW and GW, which left too great of a distance gap between GW and SW. Second, I want to get a full face high toe lob wedge (58 degree). I actually got fitted for new wedges last year and was not able to see any increase in spin with new wedges vs my old Cleveland RTX wedges. So, if I did not want the full face high toe lob wedge (58 degree) and had not purchased the new iron set which created an unacceptable gap between GW and SW I would not have needed to get new wedges at all!