An extra añejo tequila must be aged for at least three years in oak barrels that have a maximum capacity of 160 gallons (600 liters). These are dark-colored tequilas - deep amber or copper - that have a spicy oak-influenced flavor with notes such as dark chocolate, tobacco and Asian spices. They typically have a long, refined finish.
Extra añejo tequilas can display great style, depth of flavor, and finesse and are meant exclusively for after dinner sipping.
It should be noted that among tequila producers, aging tequila for more than four years is a matter of controversy. Many tequila producers oppose doing so because they feel that "excessive" oak aging will overwhelm distinctive and delicate earthy, fruity, and vegetal agave flavor notes.