for those saying that it was a mistake, it wasn't. It shows that Kishi had in mind even that back in time that Rinnegan is the final form of Sharingan, but he was still working at the design
look at the top left panel: http://www.narutobase.net/manga/Naruto/158/7
I think that now we can be sure that he didn't died of old age. Who or what do you think that is the cause of his death?
can anybody make me an avatar using this: http://www.renders-graphiques.fr/galerie/Naruto-21,5/Uchiha-Sasuke-pleure-108774.htm
all I want is the size of it to be 150x200, the rest is up on you. I'll give +rep to all who try