24 Abraham was ninety-nine years old when he was circumcised.
Genesis 17:24 Cross References - VIN
Genesis 12:4
4 So Abram went, as the LORD had told him. Lot went with him. Abram was seventy-five years old when he departed from Haran.
Genesis 17:1
1 Abram was ninety-nine years old. the LORD appeared to him and said: "I am God Almighty. Walk before me and be blameless.
Genesis 17:17
17 Abraham fell to his face. He laughed and said to himself: "Will a son be born to a man a hundred years old? Will Sarah bear a child at the age of ninety?"
Romans 4:11
11 And he received the sign of circumcision, a seal of the righteousness that he had by faith while he was still uncircumcised. So he is the father of all who believe but are not circumcised, in order that righteousness might be credited to them.