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OLED wears the most due to phosphors ageing as they are more like electroluminescent dots than true LEDs. Some OLEDs have dye filters as well as phosphors!
The dyes on the colour filter of LCDs fade with time. You can get "burn in" (I've seen it on call centre screens) and a large screen where part gets the sun each day will be slightly faded.
The eInk seems only prone to mechanical damage even though technically it's like Steampunk as it's got moving parts.
The eInk screens certainly last more than ten years, so more than battery life, which can be up to ten years. Battery life is complex depending on temperature of storage and number of equivalent full cycles and to an extent the kind of cycles. Kindles have no real off, so need connected to a charger occasionally, maybe every month or two?
So dropping it, tapping too hard, pressing too hard, something falling on the screen or bending the ereader will crack the substrate, though some larger ones may have plastic backing.
Actual use doesn't seem to be an issue.
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