The answer is: 180

Gen 35:28-29

Isaac's life spanned an impressive 180 years, and he stands as one of the pivotal characters in the Book of Genesis. He was the son of Abraham, a man of extraordinary faith, and preceded Jacob, his son who wielded great influence in Israel’s transition from a family to a nation. Isaac’s long life is rather remarkable when you consider the historical context.

Back then, lifespan was significantly longer, attributed to a variety of reasons, including dietary habits, environmental factors, and perhaps a more direct, caring relationship with the divine. It's interesting to note that Isaac's age at death is often still significant in theological discussions; he is routinely regarded as a bridge between Abraham’s profound faith and Jacob’s transformative events, culminating in the stories central to Israel's unfolding lineage.

Also, Isaac's well-documented story includes notable events like the unusual moment of being a sacrificial offering—a story metaphorically echoing themes of sacrifice and faith, which resonate throughout both the Hebrew Bible and in later Christian texts. The Mount Moriah narrative shows Abraham’s unwavering devotion but also invites readers to contemplate the nature of familial relationships. Isaac is placed uniquely as both a receiver of God’s promises and posterity’s caretaker, making him an essential connector in the scriptural latticework from generation to generation.