Genesis 17:25

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

Genesis 17:24

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

Note:  When Abraham was 99, it was 1948 years since the creation of Adam (by the way, 1948 was when the declaration (i.e., announcement) that State of Israel was born was made  by David Ben Gurion was announced), and Shem, the son of Noah, was still alive.