i saw a thing on the discovery channel that said, the next life expectancy on humans is going to be a THOUSAND YEARS.....say what? yes, a thousand years....it showed how close we were to actually making that a reality....
for goodness sakes.... the world could not accommodate or support that, and they know it...so why pursue this?
I once read a science fiction story concerning a graduation party for a 90 year old man. His graduation was leaving Earth. Seems that the key to an indefinate life span was developed, with the predictable downside. So what was decided was that the Earth was the cradle of mankind, and at 90, one left the cradle. The law for one and all, no exceptions.
I imagine that we would have to do something along this line if we developed a way of creating an indefinate life span.