Kabbalah do Rodzaju 25:7

But the days of the righteous are eternal. This is as written, "And Sarah's life was..." and "these are the days of the years of Abraham's life which he lived" (Gen. 25:7). If you say it is also written of Ishmael, "And these are the years of the life of Ishmael" (Zecharyah 13:17), (even though he was not righteous) this is only because he repented. Therefore, it is written "these are" of his days as of Abraham.