Board Thread:Naruto Discussions/@comment-3568954-20140820074807/@comment-7292165-20140825233305

Well not aging is an immortality as he'd never grow old and die from old age but that is not the only immortality. Sasori for example couldn't age and his only weakness was his core so other than that he's immortal like. Hidan couldn't die at all except if he didn't eat but other than that her survive heavy damage that could easily kill someone. Kakuzu as well having so many hearts and replacing them. A few others too. Immortality defines as living forever or decaying. You could be killed but its only a specific way.