问HN：跑鞋能穿多久？
我有一双跑鞋。我不怎么跑步，所以它们没有磨损。但它们已经26岁了。<i>整整二十六年</i>。<p>好的跑鞋能使用这么久吗？或者说，鞋底的衬垫会失去弹性吗？（我分不清是鞋的问题，还是跑道的问题，或者是我的膝盖变老了。）
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I have a pair of running shoes. I don't run very much, so they haven't worn out. But they're 26 years old. <i>Twenty six years</i>.<p>Will good quality running shoes last that long? Or will, say, the padding at the bottom lose it's springiness? (I can't tell if it's that, or if it's a bad track, or if the problem is that my knees are older.)