On New Year's Eve, I opened a bottle of this Belgian-style ale:
from 2002.
Very effervescent, fruity and tart, almost sour. It was an interesting beer, but I think it was a bit past it's age (the label said to drink it by 2007, but I had kept in the frig since then.) I tried to salvage the yeast to use in a homebrew, but didn't have much luck.
I still have some high ABV% homebrew from 1995 & 1996 that I open on occasion: a coffee stout, two spiced holiday beers, and a barleywine. I'm really surprised that they are aging so well.