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.