I have a mat that is over 10 yrars old and I haven't replaced it yet. I don't use the lines on it to measure so I just flipped it over to use the other side. It very well may be time to replace yours because every quilter uses their mat differently or more frequently. Buy yourself a nice new one and save the old one for cutting flannel, fleece or minky. Boy, does that stuff make a mess and stick in the cuts on my self healing mat.