I don't think it's age related. It's something that's inherent in all eink displays, and some screens seem to exhibit it more than others. No modern screen has anything like the amount of ghosting that the first generation eink screens did, though. They refreshed after every page turn, and needed to do so. Pretty much any modern device can go for 10 or so redraws with minimal ghosting before a full refresh is desirable.
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