The answer is: 110

Judges 2:8

Joshua’s age at death, 110 years, is significant in the context of the biblical narrative. It cast him not merely as a tactical leader but places him among the great figures of the Bible whose lifespans are intentionally mentioned, such as Moses, who lived to be 120. This three-generation framework—Moses, Joshua, then the elders—that circles the Exodus and the conquest of Canaan emphasizes a transitional period, moving from direct divine guidance under Moses to a more fragmented governance under a myriad of Judges.

Interestingly, 110 symbolizes completeness and fulfillment in biblical numerology—it crudely reflects a full life lived in service. After Joshua's leadership, the stability and covenant faithfulness he instilled starts to deteriorate, leading to the cyclic patterns of fidelity and infidelity witnessed in the subsequent chapters of Judges.

To add a fun twist to your knowledge: according to Jewish tradition, there's a custom celebrating the fact that reaching 100 years old is noteworthy; hence, Joshua's age might have sparked jubilant celebrations. Furthermore, after Joshua’s death, each Tribe faced challenges, much like how in life, we often must rise to meet our own challenges after steady times. The stories woven throughout the Book of Judges invite reflection on human nature—including struggles with fidelity and moral failings—which are timeless threads that resonate even in modern life.