Charles Spurgeon Commentary Genesis 12:4

"So Abram went, as Jehovah had spoken unto him; and Lot went with him: and Abram was seventy and five years old when he departed out of Haran." — Genesis 12:4 (ASV)

He had already attained a fine old age, but he had another century of life before him, which he could not then foresee, or expect. If, at his age, he had said, "Lord, I am too old to travel, too old to leave my country, and to begin to live a wandering life," we could not have wondered; but he did not talk in that way. He was commanded to go, and we read, "So Abram departed, as the Lord had spoken unto him."