I have had my markers for about 4 years as well but I use mine all the time. I do store them horizontally. There are a couple of colors that get very minimal use, but when I do use them, they are still fresh. So I'm wondering if it's a storage issue in your case. If they have dried up, you can revive them with rinkers. Its really simple to do. I have done it many times with pens that I have used to death.
After removing the cap, use a pair of tweezers and gently grasp the pen tip and pull straight out. Set it somewhere safe where you won't lose track of it! Then put just a few drops of reinker in the pen tube. This literally takes just 3 or 4 drops. Re-insert the pen tip with the tweezers. Scribble with the pen until the ink comes back to the tip. Even though the ink chamber of the pen is supposed to go all the way through so it feeds both tips, I find that it works better to pull the other tip out as well and repeat the refill on that side.
__________________ Susan
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