They should be able to grow specific organs and implant them during sex change operations as well as replace the old ticker. They will eventually get to the point where they can keep an extra body on hand, one with all your memories and personality to use as a replacement when you die. Things are fast approaching how they were on that cheesy old science fiction movie "Zardoz" with Sean Connery.
A trail goes two ways and looks different in each direction - There is no such thing as a timid woodland creature - Whatever does not kill you leaves you a survivor - Jesus is NOT a bad word - MSB