Isaac was 40 years old when he married Rebekah (an Aramean from Mesopotamia). Rebekah became pregnant with twins.

Esau has come to be known as the father of Caucasians. Scripture describes him as red & hairy and confirms he is the biblical enemy of Jacob (Israel). His descendants are the Edomites of the bible known for the first established kingdom in Edom. A logical question both sides need to ask ourselves is if Jacob & Esau were born from the same womb as twins then why the racial division? Some suggest interracial marriage is the key here yet it doesn't quite add up. It does however seem like scripture comes into fruition when it says the "The older will serve the younger" (Jacob/Israel will serve Esau) which has been the reality for millennia. The reader must keep in mind that Esau sold his birthright to Jacob in order to be recognized as firstborn.

²⁹ Once when Jacob was cooking stew, Esau came in from the field, and he was exhausted. ³⁰ And Esau said to Jacob, “Let me eat some of that red stew, for I am exhausted!” (Therefore his name was called Edom.^[a]) ³¹ Jacob said, “Sell me your birthright now.” ³² Esau said, “I am about to die; of what use is a birthright to me?” ³³ Jacob said, “Swear to me now.” So he swore to him and sold his birthright to Jacob. ³⁴ Then Jacob gave Esau bread and lentil stew, and he ate and drank and rose and went his way. Thus Esau despised his birthright."

-Genesis 25: 29-34