Originally Posted by Unregistered Derek
A friend just called me to ask of an unopened bottle of J&B , a half gallon from 1980, was worth more or aged more than a new bottle.
It's extra value, if it has any, is not due to it's aging in the bottle (which will be minimal or none depending on who you believe), but due to it's interest to someone who wants to drink an old version of J&B to compare it to the current release or relive some old memories. Blended whisky is not really very collectible.
Sometimes the blend changes, I'm not sure about J&B, perhaps it's somewhat valuable to someone who wants and prefers the older formulation.