Unopened bottles of Canadian Club whiskey possess an indefinite shelf life if stored properly away from direct sunlight, extreme temperature fluctuations, and severe heat, because high alcohol content inhibits spoilage. Once a bottle is opened, the whiskey will not spoil or become unsafe to drink, but prolonged exposure to oxygen over months and years can gradually oxidize the liquid, causing subtle alterations or flattening of its complex flavor and aroma profile over time.