The 30-year-old Scotch whiskey you had was mind-blowing. Ditto the 15-year-old bourbon. But that doesn’t mean you should go around looking for a super-old añejo tequila. Spirits age differently according to climate—and in warmer, sunnier Mexico they age a lot more quickly than in cold and clammy Scotland, or even in temperate Kentucky. Tequila’s soft agave-based flavors are also more delicate than those of grain-based whiskeys. Age a tequila too long and the agave will be overwhelmed by the wood, making it taste less like tequila and more like… whiskey. With that in mind, beware of any tequila aged longer than about four years.