While some products age different than others, i think this results from how much innovation is possible. Sutures are very simple in that it is basically just nylon wire. There is not much that can be improved on this. In the future someone could create a suture string which is coated with a healing agent but besides that we have reached an innovation plateau with that product. This is not the same with a lot of different types of products as technology and science allow us to incorporate so many more benefits and features into the same product. As long as people can keep up with these changes then their product will have a long and successful life or be overrun by companies who develop these changes first.