I suppose this question could pertain to any piece of hardware, although at this moment I'm concerned specifically with iPods. I'm looking to get the discontinued 160gb iPod Classic second-hand, and I'd like it to last me a few years. I take it that I should take a device's mileage - usage and overall wear-and-tear - into consideration. But sometimes you see people selling aged hardware that they claim has mostly been lying around in a drawer. Which leads me to ask: other things being equal, does age itself matter? Suppose A bought his iPod in '09, B bought the same model in '12, and C got his in '14, but all three devices are unboxed today, and proceed to be used with equal intensity. Holding everything else constant, should we expect C's device to last significantly longer than A's, and somewhat longer than B's? I imagine a battery might degenerate over time even if it isn't used, but what about other essential parts?