The answer is: 70

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

King David, one of the most significant figures in biblical history, lived a richly compelling life filled with triumphs and tragedies. He was a skilled warrior and a brilliant composer of songs, but perhaps his most remarkable quality was his deep and sometimes tumultuous relationship with the divine. Dying at the age of 70 signifies the culmination of a life that not only left a lasting legacy but also raised captivating questions about power, leadership, and redemption.

Interestingly, his 70 years echo a theme of the "three score and ten" mentioned in Psalm 90:10, generally considered the expected lifespan in the ancient world. This timestamp has become a sort of benchmark in literary and cultural references about aging. Even beyond David's lifetime, his influence can be felt resonating through various stories and texts—think of David's Psalms, which inspire countless people looking for solace and introspection today.

In the context of his decline, towards the end of his life, we find layered narratives reflecting on aging and vulnerability as seen in his relationship with his son, Solomon. It sets an unforgettable precedent for future kings and leaders reflecting the complexity of inheriting greatness. Perhaps one of the most riveting phrases associated with David is “a man after God’s own heart” (Acts 13:22), reminding us that despite his failures, his heart always sought an authentic connection with something profound and eternal.