Another question: what happens to a brain that stores so many years of memories? If there are serious complications, and I'm pretty sure that there are, chances are that they're going to be next to impossible to solve, unless some serious alteration (more brain capacity or memory erasing) happens.

I'm also assuming that any life expanding treatment would tackle senility issues (maybe with brain-repairing nanomachines? Who knows). If not, it would be far, far less useful.