The aging year of whisky in oak barrels is very important, which directly determines the quality of the wine. Most whiskies are marked by year (that is, XX year or XX year of aging). This is because whiskey is usually blended with more than one original wine, and the storage life of the original wine is indicated on the wine label, and it must be expressed by the number of years with the shortest storage time in the original wine. Therefore, if the original wine used in a wine is 10 year, 12 year and 13 year respectively, it can only be marked as 10 year on the wine label. This 10 year means "at least 10 year".
For whisky directly expressed by year, the label indicates the year when the whisky was distilled, that is, this kind of wine is made from a single original wine, or multiple original wines are all in the same year. This situation is relatively rare. Generally, the number of years obtained by subtracting the distillation year from the bottling time marked on the wine label is the number of years stored in oak barrels.