In brief, bottled white wine will last more than a year and will not “go off”. Over time, the wine will develop aged characters. Eventually, it will oxidise and turn brown, making it unpleasant, but not unsafe to drink.
There are many factors which affect white wine’s ageing ability. The sulphur dioxide levels (which act as an antioxidant) at the bottling stage, the dissolved oxygen levels at the bottling stage (this dictates the risk of oxidation from within), the oxygen permeability of the packaging material (this dictates the risk of oxidation from without), the wine’s pH level (this determines the efficacy of the sulphur dioxide to act as an antioxidant) and the temperature the wine is kept at during storage (this affects the rate of oxidation).
Bag-in-box wine has a high risk of oxidation, due to the large surface area of the container where oxygen can enter (through the plastic bag). Assuming the wine is bottled in good condition, one could assume that this type of wine has a shelf life of approximately 9 months.
For bottled wine, if the wine is bottled in good condition with a low dissolved-oxygen level, the wine can last for several years and, in many cases, the wine will continue to improve with age.
At Alvi’s Drift, our wines are bottled with moderate sulphur dioxide levels, relatively low pH levels, low dissolved-oxygen levels and sealed with Sarintin-lined screw caps (that has a very low oxygen permeability and low surface area). All these factors result in a wine that has the ability to age for several years.
However, many people prefer to drink white wine as a “fresh” product. During the bottle-ageing process, a white wine will lose its freshness and primary fruit characters, and “bottle-aged” characters will develop. These characters are more toasty in nature.
Aged white wine, as described above, is still safe to drink, as it is sterile filtered and no micro-organisms will be present. At normal wine pH and alcohol levels, no human pathogens can grow in wine.
If a product is stored at high temperatures, i.e., above 25 °C, for an extended period of time, the wine quality and freshness will be reduced. Very high temperatures (for example, if a wine is left in a car on a hot day) will reduce wine quality rapidly.
Therefore, if you buy an Alvi’s Drift white wine and store it in a cool, dark, dry place, the wine will keep for well over 12 months. This is assuming you are comfortable with your white wine slowly developing aged characters.