Most bottle manufacturers molded the year into the glass at the bottom of the bottle in 2-digit format. Youll often find it in the lower right portion when looking at the bottom (some dates are much easier to distinguish than others). This will usually tell you–within a year or two–when the whiskey was bottled.
How do you date old Coke bottles?
2:014:12Antique Coke Bottle Age | How to Tell the Age of Coca Cola - YouTubeYouTube
Can you drink 20 year old Cognac?
As long as you appropriately store it, Cognac will not go bad. And you can drink it after several years past the best by date. But improper storage can expose Cognac to air, sunlight, heat, and oxygen, which can alter the content and degrade the quality of Cognac.
Does Cognac taste like whiskey?
Does Cognac taste like bourbon? Not really. Even though they are kept in oak barrels, cognac and bourbon are different in taste, so cognac is more like a brandy which is made from grapes, while bourbon is a whiskey that is made of rye, corn, and malted barley.