08/02/2021
How old does a book have to be to be a rare book?
Most people think that if a book is older than they are, it's an old book, and often their next logical leap is that an old book is a rare book. As "Sportin' Life" sang in Porgy and Bess, "It Ain't Necessarily So." The rare book world operates by the purest of capitalistic equations. A 17th Century (that is, from the 1600s) religious tract may be objectively rare, but if there is little demand for it, it might not be particularly desirable or expensive. By the same token, a desirable modern first edition such as To Kill A Mockingbird or The Catcher in the Rye, might exist in hundreds of known copies, but thousands of collectors want a nice copy, so the demand may result in superior copies selling for impressively large sums of money. In the pursuit of desirable books, value and/or price is largely determined by supply and demand. Age comes into play, for the most part, only when the book is desirable in the first place. It's pretty safe to say that you should at least investigate any book printed before 1801 - but don't be too surprised if a book published in the 1950s might be just as, or even more valuable.
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