This Bible contradiction is from the Skeptic's Annotated Bible.
75 years old
Genesis 12:4 View context
So Abram departed, as the LORD had spoken unto him; and Lot went with him: and Abram [was] seventy and five years old when he departed out of Haran.
At least 135 years old
Acts 7:2-4 View context
And he said, Men, brethren, and fathers, hearken; The God of glory appeared unto our father Abraham, when he was in Mesopotamia, before he dwelt in Charran,
And said unto him, Get thee out of thy country, and from thy kindred, and come into the land which I shall shew thee.
Then came he out of the land of the Chaldaeans, and dwelt in Charran: and from thence, when his father was dead, he removed him into this land, wherein ye now dwell.
Genesis 11:26-32 View context
And Terah lived seventy years, and begat Abram, Nahor, and Haran.
Now these [are] the generations of Terah: Terah begat Abram, Nahor, and Haran; and Haran begat Lot.
And Haran died before his father Terah in the land of his nativity, in Ur of the Chaldees.
And Abram and Nahor took them wives: the name of Abram's wife [was] Sarai; and the name of Nahor's wife, Milcah, the daughter of Haran, the father of Milcah, and the father of Iscah.
But Sarai was barren; she [had] no child.
And Terah took Abram his son, and Lot the son of Haran his son's son, and Sarai his daughter in law, his son Abram's wife; and they went forth with them from Ur of the Chaldees, to go into the land of Canaan; and they came unto Haran, and dwelt there.
And the days of Terah were two hundred and five years: and Terah died in Haran.