Whiskey is one of the most know high-proof liquors. Does whiskey go bad? It depends on how it is stored. If you’ll store it properly, it’s going to be fine for years and the bottle you’ve bought in 80′s will taste great in 2020. If, however,  whiskey won’t be stored properly it might react in an unpleasant way. Firstly, it can change its taste and get milder. If you’ll store it in very bad conditions (high temperature, exposed to sunlight) it can even go bad!