It is best to consume extra virgin olive oil in the same year of production, although generally if store it well, it can be consumed within 18/24 months from the pressing. Extra virgin olive oil contains natural antioxidants, such as phenolic compounds and tocopherols, which protect it against rancidity, but when the time goes by, if we do not respect some preservation simple rules, their action fades or can be canceled.
First of all, we must keep the oil in cool, dry places, with non-excessive thermal excursions, and protect it from contact with air, light and heat. Contrary to common thinking, cold does not cause alterations to the product structure. The best containers are those made of stainless steel or dark glass. Beware of transparent glass containers and plastics.