This week’s parasha, Chayei Sarah, begins with the passing of Sarah: “And the life of Sarah was one hundred years, and twenty years, and seven years; the years of the life of Sarah.” (Genesis 23:1) The Sages wonder why the Torah phrased her lifespan in this strange way: a hundred years, and twenty years, and seven years. To paraphrase their answer (as cited by Rashi): at one hundred years old, Sarah was as beautiful and sinless as at twenty years old; and at twenty years old, she was as beautiful and sinless as at seven years old. This would explain one of the big puzzles of Sarah’s story: how was she always so desirable despite her advanced age?