And Terah lived seventy years, and begat Abram. (v.26)
And the days of Terah were two hundred and five years; and
Terah died in Haran. (v.32)
says that Abram didn't leave Haran until after his father died. Genesis 11:26 says
that Abram's father was 70 years old when Abram was born, and Abram's father
lived to be 205 (11:32). Clearly, then, Abram was at least 135 when he left Haran. Yet
Genesis 12:4 says he left Haran when he was only 75.