I have a bottle of "Grand Old Parr De Luxe Scotch Whisky" as well. It's still in the box and has never been opened. How can i tell how old it is and how long does it last? It doesn't have an aged time frame on it only the words "real antique and rare old." The only numbers on the bottom are "47 U4" and on the bottom left corner of the front label "PS/2/81"