Just think: A life without the damage wrought by modern antibiotics, dentistry, surgery, and preventative medicine! Where if you get sick with something that a week's worth of pills would clear right up, you're gonna die in pain! Paradise! Yep, nothing quite like the Noble Savage, who has the dignity to die of something you've only heard about in old novels.
I'm the first to admit that I probably wouldn't last a week there. It seems quite romantic, living on a deserted island, without the antics of our society. But gathering food and water is hard, or even near impossible for us. These people however, seem to have found a way to survive.
I'm assuming that, because they have lived in such a closed ecosystem for so long, they have different diseases than we have. I'm also assuming that for the diseases and medical conditions they have, they probably can find medicinal plants in the forest.
I doubt however they have the same life expectancy as we do!