On this page we devote some brain cells to exploring the outer limits of nanotechnology and the world that it might help make possible. Educated and reasonable people can debate about the future and have honest disagreements. Accordingly, we'll pose more questions than answers here, but you'll find our view peeking through the cracks. Because immortality is defined as unending life, we can safely rule it out in its strictest sense. If you spend some time thinking about this question, you come to realize that it all boils down to brain maintenance.
People get new hearts, new organs, new limbs, and change external appearance all the time.
The rest of your body takes on the role of supporting cast. Nanotechnology, coupled with major advancements in the understanding of the functioning of the human brain and body, raises the intriguing possibility of vastly expanded life spans. If all the functions of the human body are understood at a molecular level and the capability exists to engineer devices that operate at a molecular level, it should be possible to cure diseases, reverse aging, and indefinitely preserve brain function. This is a capability that is probably coming in the 21st century. The guess here is that, while societal pressure may delay these changes, they are inevitable.