Genesis 17:24
“And Abraham was ninety years old and nine, when he was circumcised in the flesh of his foreskin.”
KJV
Read in Genesis 17Meaning
The narrative records Abraham's age as ninety-nine when he is circumcised in response to the covenant command.
Read carefully
The chronological detail belongs to Abraham's story and should not be used as medical evidence about the safety or advisability of procedures at a particular age.
Reflection
The repeated age emphasizes that the covenant development occurs late in Abraham's life, after many years of waiting for the promised son.