Commentators explain that the promise of "long life" is not a simple guarantee of reaching old age. While a life of faith often promotes health and longevity, scholars like Charles Spurgeon emphasize that life's value is in its fullness, not its duration. A person can live a rich, complete life in a short time if it's filled with purpose. The promise is for a life that is qualitatively long and meaningful, regardless of the number of years.