1991 bottle that I got in a trade. Rated in May 2017. Cap was rusted, cork completely dissolved. Decanted it. Color was a deep orange-bronze and very clear except the part that was left in the bottle, which was gross looking. Very oxidized, musty aroma, old books, lemon, wet wood with a bit of rot in it, leather, peaches. Body was very oily, flat, silky smooth, full. Favor less musty than the nose, some honey, lemon, leather, old books, wood, cork. This definitely was past it prime, and I suppose I should have opened it when I first got it, but still it has help up remarkably well for a 26 year old gueuze. I look forward to trying the new one in 2019.

750mL bottle, 1990-1991 bottling (original batch), shared by JTClockwork back in 2016. Thanks, James!
Dark copper-gold with a small, off-white head atop showing low retention.
Nose is soft, succulent almost, with piquant lactic acidity on the finish and some definite fruit and tannin from the port/wood. Gains more complexity with breathing, of course, yielding vanilla, cherry and various barnyard characteristics.
Supple, soft, tightly carbonated and in excellent shape for its 25 year age. Lightly caramelized fig dances throughout moderate lactic acidity with deep B. lambicus-like cherry pie and port-like vanilla. Supple as all hell with plentiful funk on the finish. Excellent, hope to try the new batches some day.