>I've already started to save money for body/brain updates and longevity treatments. I'll gladly admit that it's more important to me than saving for a house/car or my pension. I'll rather live in a crappy apartment/with a crappy car for the next decades and afford to live 150-200 years (when immortality surely will be an option for the rich, which I plan to be) than to spend all my money on a house/car and die a natural death at 80-100 years old.

That is IMHO a bad decision. I was also thinking about this way of life for some time. The big issue here is that you are betting with your wealth life in ages (house, pension, ...) against some possibly available life extension tool.

From my point of view the technology growing rate slightly decreases in the last decade. There is already 2012 outside but we still do not have flying cars (as has been thought twenty years ago), we were not able to beat HIV, we still do not understand how the human brain works, etc etc etc.

So, my bet is that this life extension medicine will exists in a usable and working way maybe in 50 years. At this time your are already 71 or maybe even older. Do you really want to have a long life at this age??? No, I bet not. For us (I am 28) it is already too late now. And I do not want to live 200 years at an age of 80 or so. I would be old crappy man, and will be psychologically labile since there would be so much young people around me living a much longer "young" life as I did. I don't want imagine how this feels like.