Judaism There are two opinions in the Midrash as to how old Rebecca was at the time of her marriage and, consequently, at the twins' birth. According to the traditional counting cited by Rashi, Isaac was 37 years old at the time of the Binding of Isaac, and news of Rebecca's birth reached Abraham immediately after that event.Rashi writes, "The Holy One, blessed be He, announced to him [Abraham] that Rebecca, his [Isaac's] mate, had been born." Commentary on Gen. 22:20. In that case, since Isaac was 60 when Jacob and Esau were born and they had been married for 20 years, then Isaac was 40 years old when he married Rebecca (Gen. 25:20), making Rebecca three years old at the time of her marriage, and 23 years old at the birth of Jacob and Esau. According to the second opinion, Rebecca was 14 years old at the time of their marriage, and 34 years old at the birth of Jacob and Esau. In either case, Isaac and Rebecca were married for 20 years before Jacob and Esau were born. The Midrash says that during Rebecca's pregnancy whenever she would pass a house of Torah study, Jacob would struggle to come out; whenever she would pass a house of idolatry, Esau would agitate to come out.Bereshit Rabbah 63:6.
Judaism There are two opinions in the Midrash as to how old Rebecca was at the time of her marriage and, consequently, at the twins' birth. According to the traditional counting cited by Rashi, Isaac was 37 years old at the time of the Binding of Isaac, and news of Rebecca's birth reached Abraham immediately after that event.Rashi writes, "The Holy One, blessed be He, announced to him [Abraham] that Rebecca, his [Isaac's] mate, had been born" Commentary on Gen. 22:20. In that case, since Isaac was 60 when Jacob and Esau were born and they had been married for 20 years, then Isaac was 40 years old when he married Rebecca (Gen. 25:20), making Rebecca three years old at the time of her marriage, and 23 years old at the birth of Jacob and Esau. According to the second opinion, Rebecca was 14 years old at the time of their marriage, and 34 years old at the birth of Jacob and Esau. In either case, Isaac and Rebecca were married for 20 years before Jacob and Esau were born. The Midrash says that during Rebecca's pregnancy whenever she would pass a house of Torah study, Jacob would struggle to come out; whenever she would pass a house of idolatry, Esau would agitate to come out.Bereshit Rabbah 63:6.