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From what I an tell the tailed beast are entities of chakra that seem to accumulate until they are whole. ex ( this is from the anime so bare with me). Sora was sealed with some of the Nine tales chakra and like Naruto the chakra seemed to constantly grow until it had accumulate nine tails then the fox would be released. Same with Naruto he was only sealed with half but over time it seems to accumulate until it is whole. They live forever because like ninja they recover from chakra use over time. They build up charka until their number of tails are complete. When a Jinchūriki dies eventually the chakra will reconsolidated whole. This is why they are considered a natural disaster because you never know when they chakra will become whole and strike. No one knows how long it would take for a beast to become whole after the host dies which is why they try to reseal it before the host dies. I'm not sure if its possible to kill the Fox ,but if anything I think you could maybe you could use up all the chakra. That seems like the only way possibly. I hope this helps I'm not sure if I'm making since to you? TwinRisingDragons (talk) 08:14, September 15, 2010 (UTC)