Adam did not live to be 1,000.
He could not have.
He died in the prime of his youth at 930 years old.
Why could he not possibly have lived to be 1,000 or older? Simple.
“On the day you eat of the tree you will surely die,” God had said. And, “With the Lord… a thousand years is as a day.”
Thus, he had to die before reaching 1,000 years, which would be the end of the day on which Adam ate the fruit in the heavenly reckoning.
The source of this delightful reflection on the life and death of Adam is Jubilees 4.