It seems the information provided in the Biblical record requires considerable piecing together of the facts to try to ascertain Jacob's age at this time; however, we can reasonably estimate that Jacob would have been between 72 and 77 years of age when he met Rachel.
As was shown in the question, Isaac was 60 years old when Jacob was born.
And after that came his brother out, and his hand took hold on Esau's
heel; and his name was called Jacob: and Isaac was threescore years
old when she bare them. (Genesis 25:26)
Isaac, Jacob's father, lived to be 180 years old, so Jacob would have been 120 at his father's death.
And the days of Isaac were an hundred and fourscore years. (Genesis
For the rest of the calculation we have to use a little math and estimate back to the time when Jacob left his father.
First, Jacob spent 20 years with his father-in-law Laban, as he says in Genesis 31:41.
Thus have I been twenty years in thy house; I served thee fourteen
years for thy two daughters, and six years for thy cattle: and thou
hast changed my wages ten times. (Genesis 31:41, KJV)
We know, of course, that Jacob began his time with Laban the same year that he had left his father, and that it was at his first coming to Laban's home that he would have met Rachel.
Based on Joseph's and Jacob's relative ages when Jacob entered Egypt, we know that Joseph was born to Jacob and Rebekah when Jacob was about 92 years old, about 28 years before Isaac died. But Rachel had not immediately had children when they married. Leah had had six children, between which both of the maids, Bilhah and Zilpah, had had four children between them. Rachel's two were the last of the 12 sons born to Jacob.
Joseph was about 28 years old and in Egypt when his grandfather Isaac died at 180. That means Joseph was born when Isaac was about 152.
- 7 years with Laban until Jacob marries his wives
- 11 children before Rachel bears Joseph; at a minimum of 1 year between each birth, this would be 11 years
- At least one year before the first child is born
- One additional year for Joseph
- ~20 years (estimated minimum before Joseph is born after Jacob meets Rachel)
Such an estimate would mean that Joseph would have been an infant, perhaps only a newborn, when Jacob returned to his homeland and met his brother Esau. Upon meeting Esau, he had divided his family into smaller groups, fearing for everyone's safety.
And he put the handmaids and their children foremost, and Leah and her
children after, and Rachel and Joseph hindermost. . . . And Leah also
with her children came near, and bowed themselves: and after came
Joseph near and Rachel, and they bowed themselves. (Genesis 33:2,7,
But how does an infant bow himself? If Joseph were old enough to be walking and to bow, that would mean he had been born even earlier, putting the time between the births of his siblings at even closer intervals than one year--and this time would be added to Jacob's age at his departure from home (when he met Rachel).
In any case, when Jacob left Laban, Joseph had been born, but his younger brother Benjamin had not yet been born.
152 - 20 = 132 (estimated years of age for Isaac when Jacob leaves home)
This would mean, since Jacob was born when Isaac was 60, that Jacob did not leave until he was at least 72.