Abraham (v. 5). Abraham’s “good old age” was 175 years (Gen. 25:7), which means he walked with God for a century (12:4). In spite of Abraham’s occasional failures, he accomplished the will of God and brought blessing to the whole world. This promise from God must have given Abraham and Sarah great encouragement during times of difficulty, just as promises like Philippians 1:6 and Ephesians 2:10 encourage God’s people today.