My 5 years old current device still works and I expect to use it for many, many years to come. New devices have no features that I would want in my e-ink reader, and many are much worse when you compare software features.
My previous e-ink reader is still used by my daughter. I broke the frame of the reader long time ago, so I have built a cover that holds the reader together to extend the life a little bit ... and here we are 8+ years later.
An even older e-ink device (13 years old) still works, kinda-sorta. There is a glitch in an e-ink screen driver (electronics), but it is still usable. Nobody uses it, the screen is not front-lit.
The oldest e-ink reader Sony PRS500, released 16 years ago - I gave that one away after about 4-5 years. The screen was much darker in comparison with the newer models. I do not know what happened to it, I am reluctant to ask the giftee.
My oldest portable reader - an ancient clam-shell PDA with black and white matrix non-backlit LCD screen still worked when I stopped using it, and I guess it would still work if I tried to switch it on. I can't bring myself to throw it away ...
Do get a cover for your reader, even if it never leaves the room. I dropped my previous reader and shattered the plastic frame around the bezel. The glass substrate somehow survived and the device still works, held firmly in a custom-built cover.
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