I've seen that figure in non-biblical context. A guesstimate of what would be normal without disease.
Yes, it’s interesting how rarely anyone lives past 120, I think the oldest verified was somewhat over 122. That seems about the limit the human body was designed to last. I know people who have lived into their 90s, but they all seemed to start failing fairly quickly at that point. My 84 year old Dad is hale and hardy and plans to live to 100. A very good reason to not want Obamacare.