There's no question in my mind that we'll figure out the aging thing, and probably sooner rather than later.

Then the ethical questions will arise - e.g. "will only the wealthy be able to afford it?", "what happens to the world population if the birth rate doesn't go to zero?", etc.

Update: the Mars Trilogy novels deal with this issue nicely, including what could happen to your mind as you live longer. They're very good too. :) http://en.wikipedia.org/wiki/Mars_trilogy