Genesis 16:6

And Abram [was] fourscore and six years old, when Hagar bare Ishmael to Abram.

Note:  This meant Abraham was 86 years old (1 score =20).  Also, Ishmael was born 1935 years after Adam. Shem, the son of Noah, was still alive when Ishmael was born (Shem was 476 years old and would live to be 600).