The answer is: 70

2 Sam 5:4; 1 Ki 2:10-11

King David, a figure of immense strength and complexity, ruled Israel for 40 years and led his people through notable highs, including triumphs in battle and great personal failures. He eventually breathed his last at the age of 70, a noteworthy lifespan during his time, filled with both significant events and massive implications for future generations.

Interestingly, while David's reign and demise are often discussed in the context of his achievements and trials, they also serve as a narrative bridge to future biblical figures. His lineage directly connects to the promise of the Messiah in the New Testament—someone referred to as the “son of David.” This echoes the relevance of family lineage in ancient Israel, where tribal matters were just as critical in the spiritual narrative.

David's life also spotlights the tensions inherent in human leadership; he was lauded for his heroism yet faced scrutiny for his moral choices, including his infamous sin with Bathsheba. Such contradictions make his story relatable, as many leaders struggle with their own imperfections. David's legacy lives on, seen even in the Psalms he penned, which provide profound spiritual insight, often touching on themes of forgiveness, restoration, and devotion.

So, while David left the stage at 70, the ripples of his life continue to inspire and provoke thought in modern spiritual contexts, reminding readers that greatness in life can come hand-in-hand with flaws and heartfelt repentance.