
Tequila añejo is blue-agave tequila aged at least a year in oak casks of 600 L or less, usually ex-bourbon. The wood turns it amber, softens the agave and adds oak, vanilla and caramel.
Extra añejo tequila
Swaps straight in. It is older and woodier still, but sugar is low in both, so only the depth of oak changes.
In the same amount, the drink tastes brighter, with less vanilla and caramel. A barspoon of aged rum or cognac adds back some barrel character.
A last resort. One for one, the drink loses the vanilla, color, and some weight. Add a barspoon of aged rum or cognac for a touch of barrel.
"gold tequila = aged"
Gold ("oro") is often a caramel-colored mixto, not aged tequila at all.