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The lifespan of a walnut tree can vary depending on various factors such as the specific species, growing conditions, and management practices. In general, walnut trees are long-lived, with a lifespan typically ranging from 50 to 250 years. However, some walnut trees have been known to live beyond 300 years under optimal conditions.

English walnut (Juglans regia), which is commonly cultivated for its nuts, typically has a lifespan of around 60 to 80 years. Black walnut (Juglans nigra), another widely known species, can live for several hundred years if provided with favorable growing conditions.

It's important to note that the productivity of walnut trees tends to decline as they age. They may become more susceptible to diseases, pests, and environmental stresses as they mature. Proper care, including regular pruning, disease management, and appropriate soil conditions, can help extend the lifespan and productivity of walnut trees.

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