Quote Originally Posted by sutton View Post
I wouldn't fret too much about it (or go get yourself some small bottles to decant into if you need the peace of mind). I had a Glen'mo Nectar d'Or opened at least 4 yrs and a Lag 16 opened longer than that - probably closer to 7. Probably had them down below the 25% mark for at least 2 yrs+ and they still seemed OK to me. Maybe would have been noticeably different in a side-by-side with a fresh bottle, but I didn't find them "off" in any way.
That's my experience. Some SBers, though, have really, really sensitive palates. I have never had a bourbon long enough to go bad. For that matter, despite all the bitching about bad corks, I have never had a cork go bad either. Some of us are just lucky that way.