What is the classification for bourbon aged less than four years?

Bourbon that is aged for less than four years is classified as "young" or "non-aged" products. This classification is significant because bourbon must be aged in new charred oak barrels to develop its flavor profile, but aging for less than four years may not allow the spirit to achieve the depth of character expected from more mature bourbons. As a result, these younger bourbons are often noted for their lighter flavors and may not have the complexity of their older counterparts.

In contrast, premium bourbon typically implies a higher quality level and extended aging, while limited editions often refer to special releases that may not necessarily correlate with age. Aged bourbon specifically refers to bourbon that has met the aging requirement of at least four years or more, which distinguishes it from younger spirits.