Oak is a hard, water tight wood that has a natural affinity towards wine. Sometimes this term, oak aged, is on the label, sometimes it’s not.
What exactly does Oak Aged say about a wine?
If a wine is aged in oak cooperage, it increases the price of the wine significantly and depending on how long it ages, it could make it more concentrated.
There are several different ways that wine could age in oak. It could be in an oak barrel or larger cask, or maybe just a fast and cheap dunking of oak chips. This would impart more tannins and aromas in a shorter span of time.
The top producers of oak cooperage would be the United States followed by France, naturally, Yugoslavia and then Hungary.