As told by the official kahlua website, this alcoholic drink has a shelf life of four years. The product will remain drinkable long after this duration, but the impact of the coffee in the drink diminishes by the end of four years.

How do you know if Kahlua has gone bad?

If you smell any sour or other off odors, the Kahlua has likely gone bad and should not be consumed. Similarly, if there are any visual signs of mold growth, though highly unlikely (if not almost impossible), the Kahlua should be discarded.

Is it safe to drink Old Kahlua?

Although Kahlua doesn't technically expire for four years, it is recommended to drink Kahlua long before its expiration date for optimal flavor. ... If you observe any sugar crystals on the outside of your bottle, this is another signal that your Kahlua is on it's way out, but at this point it is still safe to drink.