And Abram [was] eighty years old when Hagar bare Ishmael to
Abram.
] Which is easily reckoned, for he was seventy five years of age when he left Haran, ( Genesis 12:4 ) ; and he had been ten years in Canaan when Hagar was given him by Sarai for his wife, ( Genesis 16:3 ) ; and so must be then eighty five years of age, and of course must be eighty six when Ishmael was born.
The Brenton translation of the Septuagint is in the public domain.