In science fiction, a very common theme – especially in post-singularity writing – is life extension technologies. Thus, someone who is ninety has the body of a spry, twenty-five year old. People live hundreds of years if they recieve proper treatments.
In the Bible, long, long lives happened far back in the past. The present, and the future, was a fallen state where man loses lifespan in relation to much time has passed from that original source moment of creation.
I find it interesting, and telling, that science fiction sees the future as a place full of long, long life, while Christianity yearns for a mythical past before Mankind’s terrible Fall.
Are either truly correct? I don’t know. But, it is telling that the two fields turn to different places in humanity’s timeline for their point of best, happiest, longest life.