Ambrose of Milan

My son, he said, is younger. Indeed, he is the youngest, who was almost the last born. Finally, Scripture also says: Jacob loved him, because he was the son of his old age. This also refers to Christ. For the Son of God, shining forth to the aged and already setting world, came late through the birth of the Virgin Mary, as if receiving a body as the son of old age according to the mystery, who always was with the Father before the ages. …

On the Blessings of the Patriarchs ↗

Jerome

The son of Joseph grew up, the son of Joseph grown tall above the fountain of the daughter, walking with a composed stride on the wall. And they provoked him, and contended with him, and were angry against him, having arrows. He sat in the strength of his bow, and the chains of his hands were broken, from the hands of the mighty Jacob. From there will come the shepherd, the stone of Israel from the God of your father: and the rest. …

Hebrew Questions on Genesis ↗

Bonaventure

Second, there must be the clear view of wise judgment, so that, as the dove staying over water can see the bird of prey, man too may see in Scriptures. And this pertains to Joseph, which is understood to mean "growing." "Joseph is a growing son," a most handsome son, the savior of Egypt, the leader of his brothers, meaning that he has that judgment by which a man is guide and instructor to others: and this pertains to wisdom. …

Collations on the Hexaemeron, Collation 23 ↗