Charles Ellicott Commentary Job 20:11

"His bones are full of his youth, But it shall lie down with him in the dust." — Job 20:11 (ASV)

His bones are full of the sin of his youth. —Rather, of his youth, or youthful vigour, as in Job 33:25: He shall return to the days of his youth, and Psalm 89:46: The days of his youth you have shortened. Though he is in the full vigour of life, yet it shall lie down with him in the dust.