This timeline is based on conservative dates for various events in the Bible.
Genesis covers roughly 1/3 of human history.
This date was calculated by historian Archbishop James Ussher (1581-1656) using the Bible and other ancient sources, some of which are unavailable today. Ussher took copious notes, citing his sources in detail, and showing all his calculations.
Methuselah was the last listed descendant of Adam before the Flood who could have known Adam personally. He was born when Adam was 687, and lived until the time of the Flood. This is important, because it allowed Noah the possibility (if he knew Methuselah personally) to have heard firsthand accounts of Adam and his relationship with God. Given the depraved state of the world at that time, this could have provided the influence that led him to live a blameless life for God himself.
Noah was able to carry the knowledge of the pre-Flood past into the post-Flood world. It is hardly surprising that cultures around the world have preserved ancient stories of a great, worldwide flood in their literature.
Only a worldwide flood of Noahic proportions can explain the large number of well-preserved fossils found throughout the world today. Fish fossils found on mountaintops just do not make sense from an evolutionary perspective, especially since under normal (non-flood) conditions, dead bodies rot instead of fossilizing.
Terah started having children at the age of 70 (Genesis 11:26) and lived to a total age of 205. Abram left Haran for Canaan at the age of 75, when his father died (Genesis 12:4). Therefore, Abram was born when Terah was 130. Abram was listed first among the children because of his importance, not his actual birth order. Notice that Terah lived during the same time as Noah and Shem, so if he had the opportunity to communicate with them, he could have heard about the Flood from eyewitnesses.
Since Abram lived in the same period as Shem, if he had opportunity to speak with him, he could still have heard the Flood story from an eyewitness of the event.
Sarah is the only woman whose age at death is recorded in the Bible.