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It's probably to do with the reading distance and the size of the screen. Usually a TV is a good 6-8' away, a desktop computer monitor a good 3' away, a laptop 2-3', but a tablet is much closer. I quite often take my glasses off when using my iPad Mini (even though I don't need to) and as I am very short sighted, the screen is about 6" away.
Quite possibly they're mildly long-sighted, not enough to need reading glasses under normal circumstances, but with increasing age they ought to visit their optician to check whether they should now be using reading glasses for close work.
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