Books have no expiration date, at least I think so. It is rare for properly kept books to be damaged, moldy, yellow, stuck and faded, at least for three to five years.

Ordinary books can be preserved for 20-50 years if they are properly preserved. The Library of Congress has developed an "anti-acidification" process, in which books are dried in a vacuum chamber, and then the chamber is filled with evaporated zinc. After 4-5 days, the shelf life of books can be extended from 100 to 500-600 years.