I've forgotten most of this stuff, but I'm almost 100% sure cabs are aged in oak. When the barrel is fresh, they impart a strong flavor. After several years and several uses, the barrel goes "dry". I think they have another word for it, but it essentially quits imparting any flavor to the wine.
There are several local wineries in the western part of the state and they sell this stuff, but I haven't tried it. It does smell good though. The coolest thing I've seen is that you can buy a whole barrel pre-season. Once the wine is aged, you get every bottle out of the barrel with minimal blending to make it taste good then they make furniture out of your barrel. Not sure which winery did that, but it's neat.