How long does unopened riesling keep?

Unopened Riesling can typically last for about 3 to 5 years if stored properly in a cool, dark place. Higher-quality Rieslings, especially those with good acidity and sugar balance, can age even longer, sometimes up to 10 years or more. However, it's best to check the specific vintage and producer for optimal aging recommendations. Always ensure bottles are stored upright to prevent cork deterioration.