"Going up the ladder of age, concentration, complexity (and price), the 1968 Don PX Seleccion aged in American oak butts for some 47 years before bottling, and was never blended with any other vintage. The wine has 340 grams of unfermented sugar and higher acidity given its age, as evaporation in barrel concentrates everything. This is somehow less dense and more pungent than the other old sweet wines, with more spices, lots of cinnamon and cocoa powder. It's more fluid, somehow lighter, and with some notes reminiscent of oloroso and even amontillado. There were 6,900 liters of this wine, which was bottled in various formats, including magnums, three and six liter bottles." 94 points, Luis Gutierrez, The Wine Advocate #224