The answer is: 180

Gen 35:28-29

Isaac, often seen as a lesser figure compared to his father Abraham and son Jacob, lived to the venerable age of 180 years—an impressive feat in biblical genealogies! His long life spans considerable family drama; by the time of his death, he witnessed an evolving covenant with God and experienced the complicated dynamics between his sons.

Interestingly, 180 years isn't just about longevity; it’s packed with symbolism! For instance, in Hebrew numerology, the number 18 signifies "life," as "chai." Thus, one could draw a thematic connection, suggesting that Isaac’s very essence still resonates with life's continuity within the lineage of Abraham.

Also noteworthy is Isaac's experience; he didn't lead a single life of unbroken peace. He faced strife over issues like wells with the Philistines and complexities in family relationships caused by favoritism. This underscores a biblical reality—that even the blessed patriarchs weren't exempt from life’s layered complications!

There’s a fascinating echo to consider, too: Isaac was bound for sacrifice yet deeply involved in the legacy of faith through obedience even subsequently. This story of sacrifice threads through scripture, enriching our understanding of devotion and commitment.

All in all, Isaac's story shines a light not just on historical lineage but invites introspection on how his experiences—and length of virtue—inform our understanding of faithfulness over a lifetime.