This article from blog.wired.defense is actually pretty interesting. It talks about one DoD funded scientist that is doing some interesting experiments that have yielded significant life span increases in simple organisms, along with other possible ways to save wounded soldiers by putting them in a suspended animation state.
In the Bible you hear about people living to be 800 years old. Most Christians put that off as myth, others explain it with voodoo science. Maybe something along the lines of what this researcher is into, if the environment on earth was much different before the flood, might explain things.
Regardless, the article is worth a read.