Of course. Doesn't mean we just throw our hands up in the air and stop the next 80 year old you see and say "Hold tight buddy, any minute now you'll be history and no one can help you!" Our aim has been to understand "nature" and do our best to control as much as we can and make the best of our talents. I am not saying we are all going to live forever, as Swish said, eventualy the accdients will catch up to us, but doesn't mean we shouldn't try and be optimistic about and strive for something. A few centuries ago it might have been learning to amputate an injured arm to prevent spread of infection and thus extend someone's life another few years. And now, if the goal is to be able to live forever, then so be it. We should go for it. Obviously we can't avoid the inevitable and what's not in our control but we do our best. And the path we take is through medicine to fight aging and diseases, technology to improve safety (and yes swish, that could mean Asteroid detection and avoidance tech too.. don't they now have something in Japan that detects earthquakes a few instances before it actually happens?? ) And to say that we shouldn't meddle with GOD and nature is just throwing your hands up and giving up. And if we had done that we would still be living in the pre-reniassance era.
Sure in the end, NATURE or GOD is what created us, if we run out of answers, we always have that to go to. Who doesn't love a good mystery and the prospect of an omnipresent destiny-writer who watches and controls everything? If I went to a psychiatrist and told her I had problems but didn't know what they were, I would most definitely be pissed if she also said she didn't know, I would much rather come home with some diagnosis so I can either blame my life on it or work to overcome it.
We always have the GOD answer (the GOD delusion?), but to give up just because we can't eventually overcome this giganormous force? Well I am not sure that's the reason GOD has sent us and kept us and blessed us here for.