Scientists have recently been working on trying to extend the lifespan of organisms and they claim that they have had a breakthrough. They say they can now extend an organisms lifespan to 5 times longer than normal, which means a Human could live for 500 years. See here for the full story.
I thought the same thing about vampires when I first read this. Although if everyone lived hundreds of years it'd be a little different.
Overpopulation is definitely a miserable problem that exacerbates every major worldwide issue and is especially harmful for the environment. Maybe we should invest more effort into birth control and responsible parenting before we start living for centuries.
It's hard to fathom humans living for even 100 years on average. We're already having huge problems with caring for the elderly and it's going to get worse with the baby boomers getting older.
I don't think humans were meant to live that long. If we were, we would be doing it. And just think: if everyone lived that long, the world would be so over-crowded- and, in my oppinon, it already is over-crowded. If people did this, then nature's balance would be way off. ...makes me want to 
ew.
Monsoon2D is right... 500 years would allow some amazing chances for knowledge and advancement. A 400 year veteran in science, computers or mathematics would probably be able to help advance their field quite a bit.
OMGFossil is right too... how will our bodies age? Will a 200 year old person look like Skeletor or is it possible to be a vibrant young looking person?
I have a feeling by the time they work out the kinks in this we'll all be long dead.
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Introducing, the controversial,
Overpopulation bomb!
Yes, that's right, you heard me, a bomb.
But omgomgomg, we're all gonna die!
Wrong. You see, the over population bomb will be launched into all overpopulated countries. China, India, France, and we don't have to stop there!
Hey, France isn't overpopulated!
So?
How does the overpopulation bomb work?
Well, it releases atoms, and has the power of a modern-day atom bomb, but on top of that, it releases the chemical that makes you live longer, so whoever lives, lives longer!
But wouldn't that start a war?
No, you can't deny it's productivity. It helps keep the population under conrol, but also makes them live longer. It's the ultimate solution.
Well, that concludes my segment on the overpopulation bomb, do you think it'll word?
Actually, I don't need your opinion, because I know it will, but do it for the hell of it.