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Brandy, if tightly sealed, should remain good for many, many years. If it is not tightly sealed, the alcohol will slowly evaporate. While this will reduce the strength of the brandy, it might still have good flavors. There should be no ill effects of drinking 'old' brandy that has been open for a long time as long as there is some alcohol still in the bottle.

To extend this a little bit: There's no official amount of time a brandy can be stored before the quality will begin to fade. However, once the brandy comes into contact with the air, it will gradually begin to deteriorate and evaporate. The more air in the bottle, the faster this will happen. Realistically, you can think that it's okay to store an open bottle of brandy for around six months before this deterioration becomes noticeable. If you wish, you can decant the contents into a smaller container. This ensures the air to liquid ratio remains as small as possible, helping to slow the deterioration process. But even though an open bottle will deteriorate with age, it's still fine to drink. It's just that you might notice a difference in the taste as the months go by.

For more detailed information especially on cognac: http://blog.cognac-expert.com/how-to-store-a-cognac-bottle

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11y ago

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