This page claims you can make digital photos last forever. Keep for reference...
http://www.gadgetspage.com/cameras/10-ways-to-make-your-digital-photos-last-forever.html
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This article says that photo books (such as the ones printed by Shutterfly, Snapfish, Walgreens, etcetera, are generally printed on HP printers and have a good chance of lasting for many years!
http://your-digital-life.com/merchandise/photo-books/how-long-will-photo-books-last/