Abraham was ninety-nine years old1 when he was circumcised,2
References for Genesis 17:24
and his son Ishmael3 was thirteen;
References for Genesis 17:25
Abraham and his son Ishmael were both circumcised on that same day.
And every male in Abraham's household4, including those born in his household or bought from a foreigner, was circumcised with him.
References for Genesis 17:27