[Gatsky]

I'm not sure about this argument. You could manage the issue in other ways eg enforced fixed terms for jobs.

Also, it's difficult to predict how immortality would affect human psychology, let alone how the technology would work. Perhaps we will be able to 'freeze' someone in their mid to late twenties, at some optimal point of physical health, maturity and risk taking behaviour.

I personally don't think we can take the very old and keep them alive forever. This will almost certainly result in a permanently sick state requiring constant therapy to maintain. The chance of getting cancer will approach unity at some point. Not exactly the ideal of immortal youth.

[hohenheim]

You are correct, and that is basically what I am saying. But there is two sides to the coin. Good things will decline just like bad does.