Acts 7:4 records that Terach, Abraham's father was dead when Abraham left Haran. Genesis 11:26 records that Terach was 70 years when Abraham was born. Also, Abraham was 75 years old when he left Haran.
Thus Terach lived 70 years (his age at the time of the birth of Abraham) plus 75 years (Abraham's age when he left Haran), making a total of 145 years. Genesis 11:32 however clearly states that Terach reached an age of 205 years and then he died in Haran
The wording of the above statements and the conclusions drawn from the Biblical records are inaccurate and are based on certain assumptions which are not really stated as such in the Biblical text. If we read the Biblical text carefully and accurately, this apparent contradiction can be solved without great difficulty.
Clear and definite are the references that Abraham departed from Haran when he was 75 years old (Acts 7:4), and furthermore the mention that his father Terach died shortly before while they were still in Haran at the age of 205 years old (Genesis 11:32). The mistake leading to the wrong conclusion is made in a superficial reading of Genesis 11:26 because it does not say there that erach ws 70 years old when Abraham was born! It says in Genesis 11:26 that Terach lived 70 years and "begat ABRAM, NAHOR, AND HARAN." It is evident from the other records about Terach and Abraham that Terach's three sons were not born in the same year nor were they triplets. They were born one after the other, and the records in Genesis point to the fact that Haran was the oldest son of Terach, he was followed by Nahor, and Abrhaam was actually the youngest of the three. He is however named first in this mention of the three sons of Terach for which there is a definite reason, but it is certainly not his age. He, even though the youngest, was the one God had chosen.
Terach begat the first of his three sons at the age of 70 years; Abraham was not born until 60 years later when Terach already was 130 years old. Terach did die in Haran at the age of 205 years, when Abraham was 75 years old and just before Abraham left from there to go into the land of Canaan.