Board Thread:Wiki Discussions and Support/@comment-5090714-20150427053956/@comment-3568954-20150523112358

remember he was all into his jashin rituals where he tortures his victims who knows maybe the very act of the torturing was what kept him alive in that as long as he continued to do them that he Couldn't die i wouldn't doubt it if it turned out that Jashin doesn't actually exist and that all this time hidan simply stole his victims life force which allowed him to appear to be immortal

also orochimaru was trying to find an even more pure form of immortality that didn't require the worship of someone he was searching to be the ultimate shinobi and was aiming for the top IE the power of the sage of the six paths himself