Another interpretation: Iscah, for all gazed [sokhin] upon her beauty. And it is written, "And Abraham fell upon his face and laughed" (Genesis 17:17), and so forth. How much older was Abraham than Sarah? Ten years. And he was older than her brother [Haran] by two years. It is found that when Haran fathered Sarah, he fathered her at the age of eight. And from where [do we know this]? Perhaps Abraham was the youngest of the brothers, and Scripture reckons them by their wisdom. Know that Scripture reckons them by their wisdom, for it is written, "And Noah fathered Shem, Ham, and Japheth" (Genesis 5:32), and so forth. Rather, [we learn] from here: "And Bezalel son of Uri son of Hur" (Exodus 38:22), and so forth, as is written at remez 413.
Iscah of Radiant Beauty and the Reckoning of Sarah's Years
Yalkut Shimoni on Torah 62:16
דָּבָר אַחֵר, יִסְכָּה שֶׁהַכֹּל סוֹכִין בְּיָפְיָהּ, וּכְתִיב "וַיִּפֹּל אַבְרָהָם עַל פָּנָיו וַיִּצְחָק" וְגוֹ' כַּמָּה קָשִׁישׁ אַבְרָהָם מִשָּׂרָה עֶשֶׂר שְׁנִין, וְקָשִׁישׁ מֵאַחְוּהָ תַּרִתֵּין שְׁנִין, אִשְׁתַּכַּח כִּי אוֹלִיד הָרָן לְשָׂרָה בְּתַמְנֵי אוֹלִידָהּ וּמִמַּאי, דִלְמָא אַבְרָהָם זוּטָא דְאֲחֵי הֲוָה, וְדֶרֶךְ חָכְמָתָן קָא חָשִׁיב לְהוֹן, תֵּדַע דְּקָא חָשִׁיב קְרָא דֶּרֶךְ חָכְמָתָן, דִּכְתִיב (בראשית ה, לב) "וַיּוֹלֶד נֹחַ אֶת שֵׁם אֶת חָם וְאֶת יָפֶת" וְגוֹ' אֶלָּא מֵהָכָא "וּבְצַלְאֵל בֶּן אוּרִי בֶן חוּר" וְגוֹ', כְּדִכְתִיב בְּרֶמֶז תי"ג.