It really depends on how it was kept, which method it was sealed, the age of it, so forth. Whiskey fortunately (or unfortunately...) does not age in a bottle. For example, if a properly sealed bottle produced in the 30's was opened today, it would look and taste exactly the same way it did when it was sealed. So, if you happen to have a properly sealed bottle; no evaporation, tax seal intact and unsevered, and no debris in the bottle, it should be fine to consume.
HOWEVER! It is in my opinion that you should take extreme precautions when attempting to do so. If the bottle was kept by a relative, or a person whom you happen to know, you should be safe. Be weary of buying online, as quite a few scam artists have cropped up recently buying old spirit bottles with tax seals intact, filling them with who knows what (possibly newer whiskey), and taping or gluing the seal back together. I myself have had the misfortune of buying a 1963 bottle of Seagrams VO, only to find it had the seal split, and Canadian Club poured in inlew of the proper contents. Thankfully it only cost $40, but things could have been worse....
no whiskey is distilled so it will never go bad so drink up .
No, distilled water does not go bad after opening as long as it is stored properly in a clean container.
Whiskey is bad for all ages.
No, but it adds a lot of complexity to the nose (smell) of the whiskey. Whiskey drinkers call this effect, "opening the bouquet."
At least a year or more.
They can loose their potentcy.
No
Live at Whiskey A Go-Go was created in 1998.
it is a bad idea
three weeks after opening
the farmers had to pay tax on whiskey , which was cutting into their profit and thought it was unfair
It will never go bad. Once opened the flavor may deteriorate or change. Also the alcohol will evaporate. Even if it tastes funky it will not be bad, per se.