[quote=Aragorn]
Here's why. You know how the cells regenerate? They don't regenerate perfectly. Every time a cell regenerates, it's a little different(you could argue "damaged"). There are ways of slowing this down(eating healthy, drinking a little bit of red wine every once and a while, not smoking, not drinking too much alcohol), but completely stopping it would require technology far beyond us, if it is actually possible(beyond completely freezing the body that is).
[/quote]

Isn't the obvious answer to freeze ourselves, upload our minds to computers and do stuff there, and then put our minds back into our bodies once we are done or want to have a break?[]

Edit: Besides, my bad joke, I really think that this is an intriguing question.