What is the term for coffee that is purposely stored in a warehouse for an extended period?

The term for coffee that is purposely stored in a warehouse for an extended period is "aged." Aged coffee undergoes a specific process where it is allowed to rest over time, typically in a controlled environment. This aging process can enhance certain flavor characteristics, such as developing a deeper body and additional complexity.

In contrast, "old" generally refers to coffee that has not been freshly harvested or processed, without the intentional aspect of aging for flavor development. "Fermented" refers to the process where the sugars in the coffee beans are broken down by microorganisms, which can impact flavor but is not related to the long-term storage aspect described in the question. "Dark" typically refers to the roast level of the coffee and does not imply anything about storage duration or the aging process. Therefore, "aged" accurately captures the concept of coffee that is intentionally stored for a prolonged period to develop its characteristics.