So we have not been able to extend the maximum lifetime at all. The oldest people in any era, be it Roman or mediaeval or modern, have always been around 120. The average life expectancy has been climbing, but not the maximum we can achieve. We can also make later life more comfortable, with knee replacements and the like. Thing is, any form of implants or so, tend to limit maximum life expectancy, as foreign bodies are not well tolerated in the human organism - so we tend to use them to correct a problem, which may improve life expectancy in that patient for things like cardiac pacing wires, but our oldest people are usually those that had the least medical intervention possible. Similarly, our average life expectancy has been plateauing, so this is a bit presumptuous.
Similarly, all these 'let us scan our brain' type scenarios are unbelievably silly, as we know very little of what is going on there, and no reason to think that a carbon paper copy of the brain function at one point is the same personage as 'you' are. We only have neural correlates for consciousness after all, and no demonstrable causation.
Personally, I don't think it is possible to live forever, by organic means. Our organism will breakdown eventually, and no amount of tinkering will change that. Medicine will try its best, but we are limited it seems to about 6 score at most, and the Biblical three score and 10 is a good average where most societies start slowing down their improvement. Non-organic means is in my opinion another thing in entirety, and not a continuation of the organic, and I have even less confidence in the feasibility of that.
But even more, who would want to live forever in this mortal coil? The very fact of its transience gives it so much more meaning, 'perfect' in its imperfection. Many of these theoretical attempts to achieve immortality, I think, are a bit childish, as if we are throwing a tantrum because we can't have what we want. It is much easier, and probably better, to just accept your mortality and get on with it.