Aging mezcal: reposado, añejo, aged-in-glass

Mezcal in Mexico is classified into five age categories: Joven (unaged), Madurado en Vidrio (aged in glass), Reposado (aged in wood), Añejo (aged in wood for over a year), and Extra Añejo (aged over three years). The vast majority of quality mezcal is bottled as joven – for reasons that are worth understanding.

Joven is the default and usually the right choice. A good mezcal already carries enough complexity at distillation – the pit-roasted agave, the wild fermentation, the copper or clay still – that aging often muddles rather than enhances. Most of the bottles we rate 4 agaves and above are joven.

Madurado en Vidrio (aged in glass) is the subtlest form of aging. The mezcal rests in large glass containers for six months to two years, undergoing slow oxidation without any wood contact. The result is a softer, rounder spirit – the edges mellow, the texture thickens. When done well (Rey Campero's glass-aged releases, El Jolgorio Espadín) the result is worth the wait. When done poorly it's a marketing line.

Reposado (wood-aged two months to one year) is where mezcal starts losing its character. The American oak or French oak barrels used for tequila reposados – the standard in the industry – impart vanilla, caramel, and toast notes that tend to overwhelm the agave's underlying voice. Some producers (Ilegal, Los Amantes) have built brands around reposado mezcal; in our experience, the base mezcal is usually too light-bodied to survive the oak.

Añejo (aged over a year) magnifies the reposado problem. The longer the spirit sits in wood, the more the oak dominates. Añejo mezcal at its best tastes like a mediocre single-malt Scotch; at its worst it tastes like over-caramelized tequila. The best añejo mezcal we've tasted is still worse than a good joven from the same producer.

The practical advice: buy joven. If a producer you trust has a glass-aged release, it's worth trying. Reposados and añejos are for drinkers who liked the bottle's marketing more than the mezcal inside; don't waste shelf space on them.