Genesis 41:46

Joseph was thirty years old— He was seventeen years old when he was sold into AEgypt, and consequently had been thirteen years in slavery when he stood before Pharaoh, an eastern phrase expressing his advancement; for the great counsellors and ministers alone were admitted into the interior parts of the eastern kings' palaces, to stand before them, Daniel 1:19 and to see the king's face, Esther 1:14. The sacred historian remarks this, 1st, To make us sensible that the consummate wisdom of Joseph, at so early a period of life, was a work of the Holy Spirit: 2nd, To exalt the Divine Goodness, which recompensed the troubles he suffered for thirteen years, by a long prosperity of fourscore.