Although wines don’t have an expiry date, they can taste stale/ become too old /go bad, if kept for too long, despite the bottle being unopened or sealed. the overall quality of the wine which largely depends on the quality of the grape & the storage conditions dictate how long a bottle of wine can be kept locked up! Most wines produced globally are meant to be drunk fresh & young within a year or 2. And if these wines are stored for too long, then the freshness & fruitiness of the wines is lost.