We may be on the verge of extending the life expectancy of humans dramatic, perhaps almost infinitely (thereby regaining contact with the Tree of Life for all intents and purposes).
That sounds like a lot of science fiction to me. I pretty much don't read science fiction, since it usually depends heavily on the fiction, and not so much on the science.
For example, the idea that one could live forever by putting one's consciousness into a machine keeps popping up. But the reality is that consciousness is an intrinsic property of the brain. How are those electrochemical processes that produce what we perceive as consciousness going to be transferred into a machine? Even if a machine can be programmed with all of the memories and behaviors of a living person, it still is only a simulacrum--it is not the person, and its behavior would likely diverge rapidly from the real person's behavior, since the processes of computation are quite different in a mechanical medium.
And so forth. Eternal life on earth isn't likely.
That's what people say about almost every new invention to come along. It is difficult to wrap one's mind around new ideas...just human nature.
I spent a decent amount of time working in the venture capital markets before I retired. I learned at an early age that people who do not work (in some way) with new ideas, inventions, discoveries, etc., have a difficult time understanding things not already present in our world and culture.
Basically, what the scientists will do, in their attempt to extend human life is solve one small problem at a time until the accumulation of small solved problems ends up adding years to our life span.
I question whether they will be allowed to do more than make life more functional. I tend to be doubtful that God will allow any major gains in this area before ending things.