I'm not sure where I heard this, but someone said that the current generation of humans alive will either be the last to die or the first to live forever.
Genetic engineering is interesting, but it's still very crude. The problem is that biological systems are highly complex, and exceedingly hard to understand, since clearly there is no design involved. While gene therapies etc. will certainly extend the human lifespan (just as antibiotics did), new emerging diseases afflicting the old will still put a cap on age. Case in point is cancer. When the human life expectancy was ~30-40 years old (not that long ago), cancer was rarely a cause of death. Now that people life to ~80 or so, cancer has emerged to be a major cause of death.
There's also a quality of life question. By extending lifespans, we've seen the emergence of widespread mental illness and mental atrophy as people age. This one frontier of medical science has progressed much slower than any others. Our ability to extend lives has outpaced our ability to improve lives. What new mental diseases will we see if people start living to 150?
I mentioned something similar in another thread. Understanding biology is a deconstructionist method. We cannot (yet) program biological life, so to understand it we must take existing life and play around with it. Poke it in the belly a few times and see what it spits out. While this method has worked for the last few hundred years, we are reaching a point where the sheer volume of information we are dealing with (the Human genome project, for example) will overwhelm even the best minds. Indeed, all advances in biological science these days are direct results of computer science.
Computer science, leading ultimately to machine intelligence, takes a constructionist approach. By laying a foundation in logic, we can begin constructing and abstracting functions and procedures to any level of complexity. By pursuing this route to eternal life, we avoid all the irritating details of our biological history which aren't really relevant to our consciousness (ie. all those irritating internal organs that don't do much but provide an environment in which our consciousness can exist).
Apologies if I am rambling. I recently made the decision to stop my studies in genetics/microbiology and move to computer science, so I'm really just trying to rationalize the decision to myself!
