How about this as a method of achieving immortality?

through 'gene knockout' it is possible to inhibit head development in the presentient cloned human embryo. growing to approximately adult size using artificial womb technology provides a means of transplanting tissues, organs, limbs and in future even a complete body prosthesis. i can provide such an operation every 50 years for 40 thousand dollars. think what you can do by living that you can't do by dieing. furthermore, awt will facilitate healthy babies, illiminating child mortality and morbidity. furthermore, through the application of this technology it is possible to grow novel meats, milk, wool etc without the need to kill animals, thereby feeding and clothing a population increase of say 10 times.

brain cancer will not be a problem in future. noninvasive laser surgery coupled with nanotechnology and growth factor stimulation and inhibition will mean we can regenerate our brains and maybe enhance them.

Great!!! Now we can live forever AND make women extinct at the same time!!! Well, atleast for, say 20 years, then we'll revive them!!! Atleast the pretty ones anyway!!!

What about brain cancer?

Current research suggests that each cell has a "life cycle" programmed into its DNA. While you can replace organs and body parts, eventually the cells in the brain will give out. First, you have to find a way to knock out the "life limit" gene in the brain cells. Then, figure out how to add more brain cells. Old age is not the only way these die. Head trauma, drugs (prescription or recreational) and many other things kill them. What would be the point of living to 300 if 60% of your brain cells are dead and your a vegetable? Unless you then qualify as a Parts Donor for some sassy 200 year old!

But is that a good thing? The earth is getting over-populated as is due to the invention of synthetic nitrogen fertilizers. We can feed more people and they keep popping 'em out.

In support of your enthusiasm (but not your specific approach), let me mildly contradict the answerer below who is worried about dying neurons - luckly, as discovered by a UCSF lab, we get from the ventricles fresh radial glial cells which differentiate as needed. The old Cajal hypothesis of "one and only" nervous system is dead, the brain is plastic, and existing axonal pathways are reinforced by nascent emerging percursor cells.
Over time, we will discover how to augment this process, through trophin and cell delivery in situ. There are many obstacles yet to be overcome, particularly with mitochondrial mutations which unhappily may interfere with efficient somatic cell nuclear transfer, as well as with rampant glial cells having lost responsiveness to cytokine signalling.
Nonetheless, I encourage you to pursue your interest and commence to study the field...you may find that the replacement parts are easier grown with scaffolding in vitro than via a full human clone.


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complete body prosthesis? that's impossible. are you going to do a brain transplant or something? not to mention unethical. plus you are only charging $40K. To keep thousands of undead bodies lying around for 50 years? You aren't a very good businessman/woman. What you should do is sell one body for like $1 million dollars. That why you will get to keep more than 20 times less bodies lying around. Let's think realistically here. Think of the facilities costs of maintaining healthy bodies. And what if people want a backup body? And, are you suggesting that we eat humans (aka "novel meats")? You're crazy!

NATURALLY OCCURING MUTATION

All DNA undergo natural mutation. Although there are repair mechanisms, they too arent perfect. It is estimated that humans with cease living from mutational errors around 230 years old given perfect conditioning.

Natural Mutations include random replacement of nucleotides with water molecules (or something not a nucleotide, im ma not goanna look at my genetics text because im lazy) mismatch during replication and such.

I guess in the future you can replace aging body parts but that becomes weird when all parts of your body have changed to something else but your brain. And as far as brain goes, it too is living so it will experience the mutational problem like the rest of the body. I dont see any forseeable solution to replacing a brian since your memories will also be replaced. Once you replace memories, you may as well have a new born child the natural way.