For most whiskies, you’ve got about two to three months before the flavor starts to noticeably fade. But here’s the kicker: it won’t spoil like milk or go bad like a forgotten sandwich. Whiskey is basically a preservative itself—think of it as a very slow, noble decline, not a disaster.
What actually happens is oxidation. Every time you open the decanter or pour a glass, air sneaks in and starts gently kissing the whiskey. Over time, those bright, sharp notes—like vanilla or spice—mellow out, and the whole thing becomes softer, sometimes even a little dull. It’s not ruined, just different.
