Those Christians who hold to an extremely old Earth acknowledge that both Scripture and history teach Abraham lived just a few thousand years ago. Furthermore, chronologies in Scripture identify the time between Abraham and Noah, and the time between Noah and Adam as a total only of a few thousand years.

Thirty days hath September,
April, June and November;
February has twenty-eight alone,
All the rest have thirty-one,
Except in Leap Year, that's the time
When February's days are twenty-nine.

Bible skeptics have long raised this objection to the Flood story. How could one man and his sons travel to all corners of the globe collecting all the pairs of animals to preserve them through the coming Flood? How did he even know about them? It's a serious question and deserves a careful answer.