Though unopened wine has a longer shelf life than opened wine, it can go bad. Unopened wine can be consumed past its printed expiration date if it smells and tastes OK. White wine: 1–2 years past the printed expiration date. Red wine: 2–3 years past the printed expiration date.
Sauvignon Blanc should be consumed within 18 months and at most 2 years. Some do much better. Chardonnay white wine, for instance, can last between 2 and 3 years while the better ones might keep for up to 5-7 years.