As far as I'm concerned, life's long enough (and longer than I'd like) as it is. Like I said, for me, illness and pain and growing old are part of the deal. I literally can't think of anything that would make it work for me. I just don't need it and I just don't want it.
Face it, Bookmark: not everyone has transhumanist (or transfloralist, as the cas may be) fantasies.