In fact when you combine stem cell technology with the technology known as tissue engineering you can actually grow up entire organs so as you suggest that sometime in the future you get in an auto accident and lose your kidney we'd simply take a few skin cells and grow you up a new kidney. In fact this has already been done.
He's going to be around a long long time if his body holds up. That's always a concern with a lot of players because of how much they play. A lot of guys can't handle it. But it looks like he can.