Ever since he was a kid, Marc Hodosh wondered why people had to get old and die. Now, as he prepares to co-host a healthcare conference called Life Itself with CNN's Sanjay Gupta, he looks into the possibilities we have of living longer and longer and ultimately forever. He cites the Immortal Jellyfish as an example of a creature on earth that can age, and then, when under an imminent threat, revert to infancy and start over again. A fascinating conversation on where we could be headed.