Genesis 35:28

The days of Isaac were an hundred and fourscore years. — As Isaac was sixty when his sons were born, Jacob was one hundred and twenty years of age at his father’s death, and one hundred and thirty when he appeared before Pharaoh (Genesis 47:9). Now, as Joseph was seventeen when sold into Egypt (Genesis 37:2), and thirty when raised to power (Genesis 41:46), and as the seven years of plenty and two of the years of famine had passed before Jacob went down into Egypt, it follows that the cruel deed, whereby he was robbed of his favourite child, was committed about twelve years before the death of Isaac.