"As for you, you shall go to your fathers in peace;
you will be buried at a good old age."
God had given Abraham a vision of his descendants' future: “Know for certain that your descendants will be strangers in a land that is not theirs, where they will be enslaved and oppressed four hundred years. But I will also judge the nation whom they will serve, and afterward they will come out with many possessions." Then he went on to tell Abraham that he himself would join his forefathers in peace and be buried at "a good old age" (175 years sounds like "a good old age" to me). God gave Abraham a special look at what was to come. It was all about the covenant that He was making with Abraham and his descendant Israel. An everlasting covenant. God kept His promise, He is keeping His promise and He will keep His promise to Abraham. Our God is a covenant God. What He says He will do, He will do. "Know therefore that the LORD your God, He is God, the faithful God, who keeps His covenant and His lovingkindness to a thousandth generation with those who love Him and keep His commandments;" (Deuteronomy 7:9)