It’s one of the most common things people say when they finally come to see me: “I just thought it was my age.” And while some wear and tear is a natural part of life, significant knee pain is not something you simply have to put up with. Knowing the difference could mean the difference between managing pain for years unnecessarily — and getting back to the life you want.Here are five signs your knee pain deserves a closer look.1. The pain is disrupting your sleepOccasional soreness a...