Your confusion is understandable. I have been an off and on collector/drinker for the past 20 years and its still a crap shoot. The best old age wine I've had was 70 Cote de Beaune Villages and it never left its underground cellar til the night we drank it. Wines that travel are not always the best candidates for aging. They mature faster in my humble opinion. On top of that, even the best, New World wines (that includes Australia) really are not meant to age vis a vis Bordeaux or Burgundy. So, I would agree with one of the other writers that this wine is probably peaked and should be drunk now. I'm not sure what "limited edition vintage" means. 96 was decent year for Australia and Wolf Blass's propaganda sheet on Black Label is that they use the best grapes from their vineyards to a make it. None of that means it can keep for 18 plus years. Nevertheless, if your first born is few years from 18, I'd keep it, if only for uniqueness of the gift and the dedication to keep it for that length of time. Assuming you have stored it properly, the wine should be fine to drink, unless you have palate like, say, Robert Parker that is.