The answer is: 70

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

King David, a cornerstone figure in the Hebrew Bible, passed away at the age of 70, as confirmed in the second book of Samuel and first Kings. His life's span might seem short, yet within those years, he made a gigantic impact that resonates even today. David's reign lasted over 40 years, filled with his many heroic exploits and moral complexities, often reminding us that greatness often comes with personal struggles.

Interesting trivia: David's life isn't just action-packed; it features elements that are quite relatable. He went from being a shepherd boy to the most revered king of Israel, which is a testimony to humility and the potential of unexpected leadership. He is also often connected with the early literature of psalms—about half of them are attributed to him. It's intriguing how the emotions within those psalms range from heights of joy to depths of despair, showing David as both a man of action and of deep reflection.

The echoes of David’s story can be seen across landscapes of literature, art, and music, encapsulating themes of love, conflict, and faith. You could say that today, when we face our own “giant” challenges, David’s legacy offers inspiration—proving that every life can be an epic tale of struggle and triumph, irrespective of the years divided by the lifespan. So while 70 may be just a number, for David, his years were filled with enough spirit to last through the ages!