Yaakov was blessed in Year 2171 at age sixty-three, and Yitzchak was one hundred twenty-two years old. And he fled to the house of Ever son of Shem [(see Year 2084 that he was the son of Shem's son's son)] because of his brother Esav. And he hid there for fourteen years and learned the ways of HaShem and His commandments until Year 2184. [In Shir HaShirim Rabbah chapter 96, in Nisan Yaakov was blessed.
In the Zohar on Parshat Toldot, the Holy One, Blessed be He, did not want to reveal to Yitzchak the wickedness of Esav so that Yaakov would be blessed by him without his knowledge. And this is because since Yitzchak was entirely a burnt offering, he could not bless except from the good of the land, and also not from his own (Seder HaKabbalah section 9, 1).]