Why Are My Joints So Stiff, especcially as we get older.
As we age, our cartilage -- the spongy material that protects the ends of our bones -- begins to dry out and stiffen. Our body also makes less synovial fluid, the stuff that acts like oil to keep your joints moving smoothly. The result: our joints may not move as freely as they used to. It sounds a little crazy, but the best thing you can do is keep on trucking. Synovial fluid requires movement to keep your joints loose.