(Now he was thirty years old when he stood before king Pharao) and he went round all the countries of Egypt.

And Joseph was thirty years old when he stood before Pharaoh king of Egypt. And Joseph went out from Pharaoh, and passed through the whole land of Egypt.

And Joseph is a son of thirty years in his standing before Pharaoh king of Egypt, and Joseph goeth out from the presence of Pharaoh, and passeth over through all the land of Egypt;

(Now he was thirty years old when he stood in the sight of king Pharaoh.) And he traveled throughout the regions of Egypt.

Joseph vero erat vir triginta annorum, quando stetit coram Pharaone rege Aegypti: et egressus est Joseph a facie Pharaonis, et transivit per totam terram Aegypti.

And Joseph was thirty years old. For two reasons Moses records the age at which Joseph was advanced to the government of the kingdom. First, because it is seldom that old men give themselves up to be governed by the young: whence it may be inferred that it was by the singular providence of God that Joseph governed without being envied, and that reverence and majesty were given him beyond his years. For if there was danger lest Timothy's youth should render him contemptible, Joseph would have been equally exposed to contempt, unless authority had been divinely procured for him. And although he could not have obtained this authority by his own industry, yet it is probable that the extraordinary virtues with which God had endowed him, availed not a little to increase and confirm it. A second reason for noting his age is, that the reader may reflect on the long duration of the sufferings with which he had been, in various ways, afflicted. And however humane his treatment might have been; still, thirteen years of exile, which had prevented his return to his father's house, not merely by the bond of servitude, but also by imprisonment, would prove a most grievous trial. Therefore, it was only after he had been proved by long endurance, that he was advanced to a better state. Moses then subjoins, that he discharged his duties with diligence and with most punctual fidelity; for the circuit taken by him, which is here mentioned, was a proof of no common industry. He might, indeed, have appointed messengers, on whose shoulders he could have laid the greater part of the labor and trouble; but because he knew himself to be divinely called to the work, as one who had to render an account to the divine tribunal, he refused no part of the burden. And Moses, in a few words, praises his incredible prudence, in having quickly found out the best method of preserving the corn. For it was an arduous task to erect storehouses in every city, which should contain the entire produce of one year, and a fifth part more. [1] This arrangement was also not less a proof of sagacity, in providing that the inhabitants of any given region should not have to seek food at a distance. Immediately afterwards his integrity is mentioned, which was equally deserving of praise; because in the immense accumulation which was made, he abstained from all self-indulgence, just as if some humble office only, had been assigned to him. But it is to the praise of both these virtues that, after he has collected immense heaps, he remits nothing of his wonted diligence, until he has accomplished all the duties of the office which he had undertaken. The ancient proverb says, "Satiety produces disgust," and in the same manner abundance is commonly the mother of idleness. Whence, therefore, is it, that the diligence of Joseph holds on its even course, and does not become remiss at the sight of present abundance, except because he prudently considers, that, however great the plenty might be, seven years of famine would swallow it all up? He manifested also his fidelity, and his extraordinary care for the public safety, in this, that he did not become weary by the assiduous labor of seven years, nor did he ever rest till he had made provision for the seven years which still remained.

Footnotes

1 - "The labors of Joseph in building storehouses are placed vividly before us in the paintings upon the monuments, which show how common the storehouse was in ancient Egypt. In a tomb at Elethya, a man is represented whose business it evidently was to take account of the number of bushels which another man, acting under him, measures... Then follows the transportation of the grain. From the measurer, others take it and carry it into the storehouses." -- Egypt and the Books of Moses, p. 36. -- Ed

Joseph was thirty years old - As he was seventeen years old when he was sold into Egypt, Genesis 37:2, and was now thirty, he must have been thirteen years in slavery.
Stood before Pharaoh - This phrase always means admission to the immediate presence of the sovereign, and having the honor of his most unlimited confidence. Among the Asiatic princes, the privilege of coming even to their seat, of standing before them, etc., was granted only to the highest favorites.

And Joseph [was] (n) thirty years old when he stood before Pharaoh king of Egypt. And Joseph went out from the presence of Pharaoh, and went throughout all the land of Egypt.
(n) His age is mentioned both to show that his authority came from God, and also that he endured imprisonment and exile for twelve years or more.

And Joseph was thirty years old when he stood before Pharaoh king of Egypt,.... Interpreting his dreams, and had such honour conferred upon him as to be made his prime minister; from whence it appears that Joseph had now been thirteen years in Egypt, partly in Potiphar's house, and partly in prison, since he was seventeen years of age when he was sold thither, see Genesis 37:2,
and Joseph went out from the presence of Pharaoh; from standing before him, and ministering to him as his counsellor and chief statesman, or he went out from his court and palace for a while:
and went throughout all the land of Egypt: this seems to be a second tour; before he went to survey the land, and pitch upon the most proper places for granaries to lay up store of corn in; and now he went through it, to gather in and give directions about it, and see it performed, for the years of plenty were now begun.

In the names of his two sons, Manasseh and Ephraim, Joseph owned the Divine providence. 1. He was made to forget his misery. 2. He was made fruitful in the land of his affliction. The seven plenteous years came, and were ended. We ought to look forward to the end of the days, both of our prosperity and of our opportunity. We must not be secure in prosperity, nor slothful in making good use of opportunity. Years of plenty will end; what thy hand finds to do, do it; and gather in gathering time. The dearth came, and the famine was not only in Egypt, but in other lands. Joseph was diligent in laying up, while the plenty lasted. He was prudent and careful in giving out, when the famine came. Joseph was engaged in useful and important labours. Yet it was in the midst of this his activity that his father Jacob said, Joseph is not! What a large portion of our troubles would be done away if we knew the whole truth! Let these events lead us to Jesus. There is a famine of the bread of life throughout the whole earth. Go to Jesus, and what he bids you, do. Attend to His voice, apply to him; he will open his treasures, and satisfy with goodness the hungry soul of every age and nation, without money and without price. But those who slight this provision must starve, and his enemies will be destroyed.

Joseph was thirty years old when he stood before Pharaoh--seventeen when brought into Egypt, probably three in prison, and thirteen in the service of Potiphar.
went out . . . all the land--made an immediate survey to determine the site and size of the storehouses required for the different quarters of the country.

Joseph was 30 years old when he stood before Pharaoh, and went out from him and passed through all the land of Egypt, i.e., when he took possession of his office; consequently he had been in Egypt for 13 years as a slave, and at least three years in prison.