True most blended whisky does not gather any real value until it is about 50 years after production...However, your bottle is also not easy to find, and there have been several postings over the past year of two by people trying to find Old Parr (I assume OP 12). Should be someone willing to pay a few $ to get their hands on it...particularly if they are in a country where it is not readily marketed, like the US.
If I didn't have about 50 other bottles to finsh-off I'd probably look at buying yours, as I have never had this brand, and the tasting reviews sound pretty good...
Mind if I ask where you are from?
Walter C Hurst