Here’s the golden rule: Hard liquor like vodka, gin, whiskey, and rum doesn’t really “go bad.” Not in the way milk does. You won’t find fuzzy mold floating in your bourbon.
The alcohol is a natural preservative. It kills pretty much anything that would try to grow in there. So, from a safety standpoint? That bottle of tequila from your college graduation is still drinkable. Congratulations, you’re not going to die.
But—and this is a big, dramatic “but”—it will change. The flavor is the real casualty here. Think of it like a friendship you haven’t called in five years. It’s still there, but it’s a little… faded.
The Big Villain: Air (Not Your Ex)
Once you open a bottle, you let oxygen in. That sneaky little gas starts slowly munching on the flavor compounds. This process is called oxidation. Fancy word, simple result: your liquor gets dull.
You’ll notice it most with delicate stuff. An open bottle of vodka might get a little watery or lose its “bite” after a year. A gin will wave goodbye to its lovely botanical notes. Herbs and juniper? Poof.
And don’t even get me started on liqueurs. Those sugary, creamy little devils (think Kahlúa, Baileys, or St-Germain) have a much shorter shelf life. The sugar and dairy can actually turn. They’re the drama queens of the liquor cabinet.
