No historical record goes back more than 4,000 years. So there is conflict between historiens and anthropologists or arehaeologists.
Scientists say it is much older.
T'he time between Adam and Abraham is considered as the prehistoric age. At that time, according to the Bible, people lived 800 or 900 years. We don't know if they had the same kind of calendar we have today. Nine hundred years in their time might not be 900 years by our way of measuring time. As it says in the Bible, one day is like a thousand years and a thousand years as one day.