How old art thou? This familiar question proves that Jacob was received courteously and without ceremony. But the answer is of far greater moment, in which Jacob declares that the time of his pilgrimage was a hundred and thirty years. For the Apostle, in his epistle to the Hebrews, (Hebrews 11:13-16,) gathers hence the memorable doctrine, that God was not ashamed to be called the God of the patriarchs, because they had confessed themselves to be strangers and pilgrims on the earth. Of one man only this is mentioned; but because he had been instructed by his forefathers, and had handed down the same instruction to his son, the Apostle honors them all with the same eulogy. Therefore, as they were not ashamed to wander during the whole course of their life, and to be opprobriously called foreigners and strangers wherever they came; so God vouchsafed to them the incomparable dignity, that they should be heirs of heaven. But (as it has been said before) no persons ever had a more peculiar and hereditary possession in the world, than the holy fathers had in the land of Canaan. The Lord is said to have cast his line, in order that he might assign to each nation its bounds: but an eternal possession, through a continual succession of ages, was never promised to any nation, as it was to the posterity of Abraham. In what spirit, then, ought we to dwell in a world, where no certain repose, or fixed abode is promised us? Moreover, this is described by Paul as the common condition of all pious persons under the reign of Christ, that they should "have no certain dwelling-place;" (1-Corinthians 4:11;) not that all should be alike cast out as exiles, but because the Lord calls all his people, as by the sound of the trumpet, to be wanderers, lest they should become fixed in their nests on earth. Therefore, whether any one remains in his own country, or is compelled continually to change his place, let him diligently exercise himself in the meditation, that he is sojourning, for a short time, upon earth, till, having completed his course, he shall depart to the heavenly country.

And Pharaoh said unto Jacob, how old art thou? Or, "how many are the days of the years of thy life?" which way of speaking Jacob takes up, and very pertinently makes use of in his answer that follows: Dr. Lightfoot (m) thinks Pharaoh had never seen so old a man before, so grave a head, and so grey a beard, and in admiration asked this question.
(m) Works, vol. 1. p. 667.

Pharaoh said unto Jacob, How old art thou?--The question was put from the deep and impressive interest which the appearance of the old patriarch had created in the minds of Pharaoh and his court. In the low-lying land of Egypt and from the artificial habits of its society, the age of man was far shorter among the inhabitants of that country than it had yet become in the pure bracing climate and among the simple mountaineers of Canaan. The Hebrews, at least, still attained a protracted longevity.

How old art thou? - A question usually put to old men, for it is natural to us to admire old age, and to reverence it. Jacob's countenance no doubt shewed him to be old, for be had been a man of labour and sorrow. In Egypt people were not so long - lived as in Canaan, and therefore Pharaoh looks upon Jacob with wonder.