Holier Than Thou - Biblical Contradictions

Was Jacob's son Benjamin a young boy or an older man when his clan entered Egypt?

Genesis 44:20-22, "And we answered, 'We have an aged father, and there is a young son born to him in his old age. His brother is dead, and he is the only one of his mother's sons left, and his father loves him.' Then you said to your servants, 'Bring him down to me so I can see him for myself.' And we said to my lord, 'The boy cannot leave his father; if he leaves him, his father will die.' "

Genesis 44:30-34, "So now, if the boy is not with us when I go back to your servant my father and if my father, whose life is closely bound up with the boy's life, sees that the boy isn't there, he will die. Your servants will bring the gray head of our father down to the grave in sorrow. Your servant guaranteed the boy's safety to my father. I said, 'If I do not bring him back to you, I will bear the blame before you, my father, all my life!' Now then, please let your servant remain here as my lord's slave in place of the boy, and let the boy return with his brothers. How can I go back to my father if the boy is not with me? No! Do not let me see the misery that would come upon my father."

Genesis 46:8, 21, "These are the names of the sons of Israel (Jacob and his descendants) who went to Egypt... The sons of Benjamin: Bela, Beker, Ashbel, Gera, Naaman, Ehi, Rosh, Muppim, Huppim and Ard."

According to Genesis chapter 44, Jacob's youngest son Jacob was just a boy, however, according to Genesis chapter 46, Jacob had ten sons.

"Sorrow is better than laughter: for by the sadness of the countenance the heart is made better. The heart of the wise is in the house of mourning; but the heart of fools is in the house of mirth." (Ecclesiastes 7:3-4, KJV)

"Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry: for that shall abide with him of his labour the days of his life, which God giveth him under the sun." (Ecclesiastes 8:15, KJV)