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Wouldn't you think the human lifespan would naturally be longer, thanks to the mere presence of advanced technology of the 23th and 24th centuries? At least McCoy had the right idea: any day you're not in the ground is a good day.
No,

i wouldn't think that.
Why? Human lifespan is set at about 100 years- 120 max. Their bioclocks
wind down after that as a matter of evolutionary survival. Remember its
the genes that make it, and having 150+ 200 year old infants walking around a tribe with 500 members just isn't in natures design.
The question of life extension is already upon us. The technology we have now if applied to its fullest billion dollar level could keep most people alive
well into the 100s. BUT. Quality of life ? Genetically, the idea is to reproduce and die. Period. And if you assume as most people in our culture do that death is THE END... well, i can see why you'd want to avoid it.
However, Death is a lot more like spiritual puberty- at least if you have the maturity to work the situation to your favor rather than drown in entropy.
Avoiding death to live a feeble life seems a bit silly, given the alternative of
just letting nature take its course and having all the fun in the universe once you are free of a body.
http://www.youtube.com/watch?v=4iwUZOnB9J4
"And if I die today Ill be the happy phantom
And Ill go chasin the nuns out in the yard
And Ill run naked through the streets without my mask on
And I will never need umbrellas in the rain
Ill wake up in strawberry fields everday
And the atrocities of school I can forgive
The happy phantom has no right to bitch
Oo who- the time is getting closer
Oo who- time to be a ghost
Oo who- everyday were getting closer
The sun is getting dim
Will we pay for who we been
So if I die today Ill be the happy phantom
And Ill go wearin my naughties like a jew
Theyll be my ticket to the universal opera
Theres judy garland taking buddha by the hand
And then these seven little men get up to dance
They say confucius does his crossword with a pen
Im still the angle to the girl who hates to sin
Oo whoo- the time is gettin closer
Oo who- the time to be a ghost
Oo who- everyday were getting closer
The sun is getting dim
Will I pay for who I been
Or will I see you dear and wish I could come back
You found a girl that you could truly love again
Will you still call for me when she falls asleep
Or do we soon forget the things we cannot see
Oo who- the time is getting closer
Oo who- the time to be a ghost
Oo who- everyday were getting closer
The sun is getting dim
Will I pay for who I been
And if I die today
And if I die today
And if I die today
Chasin nuns out in the yard"