Yes, my son was born this way too. He is funny, bright, happy, loves to read and loves to tell stories.
So last night, he was describing something the new blurbs at the end of movies nowadays, and how they used to be a prequel to the next movie, but that The Dark Knight did not have, which of course I know this as I took him to that movie, so I thought he had made his point and I returned my attention to the word search puzzle I was working on with my daughter, and he says to me, but I don't hear it, "So I guess your not listening anymore?"
And I reflexively say, "Hm, hm." And they both burst out laughing and I don't know what its about. Because I honestly did not hear him, they had to fill me in.
I told my son a long time ago that he should really consider being a DJ in high school and college with a future in talk radio.
I don't have any advice that works, only that I do say a lot of Ohs, and Ahs, and Hmmms, through out the day and don't listen to every detail. I do know to listen when it's important. Otherwise, it's pretty much in one ear and out the other.
My son also had his own Ipod about your sons age. So he can listen to a lot of great music we uploaded and that seems to buy me some quiet time.