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I think all of this is highly individual and it is difficult to draw any general conclusions. Personally I don't perceive any difference in retention, in fact there are a few books in my collection from about the time when I made the switch from paper to eink where I have no idea whether I read them on paper or my old Sony PRS-600. I have both versions. Which did I read? Impossible to tell.
And I'm 40.
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