How old was Terach (Terah) when Avram (Abram) was born?
Answer From The Annual Reading Schedule - Week 3 Notes For Genesis: Although Genesis 11:26 says Terach (Terah) was 70, this is actually like Genesis 5:32 which is generalizing about Noach (Noah) being 500 when Shem was born, when in actuality he was 502. We know that Noach was actually 502 years old when Shem was born because the flood came when Noach was 600 years old (Genesis 7:6), and Shem was 100 years old 2 years after the flood (Genesis 11:10). Similar to that, where Shem may have been listed first due to genealogy and not due to age, Avram (Abram) is listed first in Genesis 11:26 but probably was not the one actually born when Terach was 70. Since Terach died at the age of 205 before Avram left Charan (Haran) (Genesis 11:32), and Avram left when he was 75 (Genesis 12:4), Terach was probably actually 130 when Avram was born and 70 when Avram's oldest brother was born. I am speculating Avram was not the first born. Shem and Avram are probably listed first because they are in the genealogy leading up to King Dawiyd (King David) and therefore also Yahushua.