While there is no fixed definition of how old a book must be to be considered antique, books from the 19th century and earlier are often categorized as antiques. However, some collectors and experts may consider books from the early 20th century or even more recent decades as antiques, depending on their rarity, significance, or cultural importance.

Antique books can encompass various genres, including literature, history, science, art, religion, and more. They often possess unique features, such as ornate bindings, illustrations, engraved plates, and special editions. These books may be sought after by collectors, scholars, historians, or individuals with a passion for preserving and appreciating cultural artifacts.

For convenience, at Books That Expand The Mind have defined “Antique Books” as books that are at least 100 years old.

It's important to note that the value of an antique book is not solely determined by its age. Factors such as rarity, condition, author, edition, and historical importance also play significant roles in determining the value of an antique book.