Armagnac is sold under several classifications, mostly referring to the age of the constituent brandies. Armagnac is allowed to be sold under vintages. When Armagnacs of different ages have been blended, the age on the bottle refers to the youngest component. A three-star, or VS, Armagnac is a mix of several Armagnacs that have seen at least two years of aging in wood. For VSOP, the aging is at least three years, and for XO, at least six. Hors d'age means the youngest component in the blend is at least ten years old. Older and better Armagnacs are often sold as vintages, with the bottles containing Armagnac from a single year, the year being noted on the bottle.