"Walk before me, and be blameless." This statement was addressed to Abraham at the age of _____

This statement was addressed to Abraham when he was 99 years old. The Bible says that God appeared to Abraham and changed his name from Abram to Abraham, and also changed his wife Sarai's name to Sarah. God also made a covenant with Abraham, promising to make him the father of many nations and to give him and his descendants the land of Canaan. As part of this covenant, God told Abraham to "walk before me, and be blameless." This meant that Abraham was to live a righteous and obedient life, setting an example for others to follow.