Verse

Genesis 17:24

A church father on this verse
Don't think it was without purpose that Scripture indicated to us his age; instead, it was for you to learn from the just man's obedience in meekly submitting to pain despite his extreme old age on account of God's command, and not only he but also Ishmael and all the servants—that was the reason for giving the ages.
John Chrysostom, 5th c. — HOMILIES ON GENESIS 40.14
Original

24And Abraham was ninety years old and nine, when he was circumcised in the flesh of his foreskin.

Modern

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In context

22And he left off talking with him, and God went up from Abraham.

23And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.

Genesis 17:24

25And Ishmael his son was thirteen years old, when he was circumcised in the flesh of his foreskin.

26In the selfsame day was Abraham circumcised, and Ishmael his son.

Read all of Genesis 17