Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Old vine (French: vieilles vignes, German: alte Reben) is a term commonly used on wine labels to indicate that a wine is the product of grape vines that are notably old. The practice of displaying it stems from the general belief that older vines, when properly handled, will give a better wine. However, in France, the U.S., and most countries, it has no legal or even generally agreed upon definition.Grape vines can grow for over 120 years. After about 20 years vines start to produce smaller crops, and average yields decrease, leading to more concentrated, intense wines. Diseases such as "dead arm" can also afflict old vines, in some cases further concentrating the juice. "Old vines" might apply to an entire estate, or it might mean only a certain parcel planted before others. In the U.S., the most common use is on Zinfandel, because in California vineyards up to 125 years old are still bearing small amounts of prized Zinfandel fruit.