I think people are missing the point of what a lot of this new research is moving towards. It's not to just make it so we live our normal lives and where it would normally end we would just live longer because we can cure problems that would normally be fatal at that age. It's to make it so the DNA errors don't happen and that it corrects it's self, deal with cell degradation over time,... So that aging wouldn't happen the way it does now. You may be 100 but have the body of a 20 year old because all the of degradation of your body wouldn't happen.
Now there would be things that you would need replacement organs, or replenishment of certain parts due to external forces. But this is also being addressed with organs being grown in the lab using your own DNA. If we have figured out how to deal with DNA breaking down as we get older those organs would be brand new.