outhouse
Atheistically
I don't think it's either. The Bible says people lived that long, so I believe it.
Notice that people stopped living extremely long lives after the flood. Perhaps if the flood (and rain, and the resultant environmental effects of these) never happened then people be living for hundreds of years now. (Edit: except for Ps 90.)
That's my reality of it anyway.
A few problems with this.
There never was a global flood
there is no evidence in any bone fragments that show this
really this isnt up for debate, i do find it sad people cannot see through this, and people choose a 3000 year old book mostly fiction over history and science and reality.