Yeah, I will leave it to you to enlighten me. Quite frankly, I'm not that interested and don't have the time. I have better things to worry about.
But David, I am only doing what I HAVE SEEN YOU DOING.
It seems that your understanding on something as trivial as this is a waste of time for you to come to grips with. You claim that you have a passion for theology, teaching, and preaching the Word of God, but you are not prepared to spend some time correcting your understanding on this question and will teach and preach from your ignorance when ever your are dealing with this area with respect to the history of Israel.
If you feel that you can correct everybody else, then please follow your expectation and spend some time learning about what is actually contained within the scriptures.
I am sure that when people actually read the passage I have suggested above they will realise that there is a time period required for both Judah and Benjamin to establish their descendants between the time that Joseph is dispatched down to Egypt as a slave and when both Judah and Benjamin go done to Egypt with their father, Jacob. Judah gets a grandson after his liaison with Tamar after his wife dies, and then one of the twin born to Tamar also marries and has a child. Benjamin is only 10 years old when Joseph is sent down to Egypt by his older brothers but he marries and has ten sons who go down to Egypt with their father and Jacob. The stories of both Judah and Benjamin logically demand that Joseph is second in command of Egypt for at least 14 - 17 years before the seven years of plenty starts. This suggests that Joseph was probably around 55 years of age when his brothers go down to Egypt to get grain and meet with him the first time unaware that he is their brother.
But as you say, David, this is nothing but a trivially matter. But if you treat this question as trivial, what other sections of the bible do you also treat as trivial?
Shalom