According to XYZ Collectibles, there are many old National Geographic magazines that are worth money. For instance, the January 1902 edition of National Geographic is valued at $816.50 as of 2014.
The value of a magazine is not solely defined by its publication date, however the older the publication, the greater its value. However, the oldest magazine that is not in good condition is worthless.
While some wear is expected, an old National Geographic magazine must not be torn, scuffed, water marked or otherwise damaged to be considered a collector’s item. Collectors, auctioneers and antique dealers are a good source of information about the value of old magazines.