It has been proved that some tires sit on the shelves for many years before they are sold to consumers.
Most tires become dangerous and a driving hazard after having over 6 years of life. These tires could come apart while driving without any warning. Have you ever wondered why you see a layer of tire rubber on side of the highway while the thread still looks fairly good? Well maybe that tire looks new but the actual rubber is 14 years old...
After all tires are made out of rubber and not much more....