A Kindle survey shows that the majority of readers are over fifty:

The comments themselves are as illuminating as the numbers. So many users said they like Kindle because they suffer from some form of arthritis that multiple posters indicate that they do or do not have arthritis as a matter of course. A variety of other impairments, from weakening eyes and carpal-tunnel-like syndromes to more exotic disabilities dominate the purchase rationales of these posters. Which in turn explains Amazon's pseudo-statistical case that e-book purchases are incremental/additive, rather than cannibalistic of their print sales. Countless people report being able to read much more with Kindle because it overcomes physical obstacles or limitations that had made reading difficult for them previously.

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