so...then what exactly is the documented lifespan of Adam?
Were we talking about the oldest person who was dead, or the person who lived the longest that was dead?
The word "documented" is infinitely elastic. Dragons be there.
Don't go there.
For myself, I know what "documented" is, and no holy book on earth qualifies. Otherwise there would be no need to invent (or use) the word Faith.
Jorge Luis Borges, the noted Argentinian writer of "fantastic literature", including "made up" classic non-fiction, covers the whimsical nature of this topic quite well.