Job 21:23

“One dieth in his full strength, etc.] Man is born a weak feeble creature, and it is by degrees, and through various stages of infancy, childhood, and youth, that he arrives to his full strength in manhood; and, when he does, sometimes so it is, that his strength is not weakened in the course of his life by a train of disorders and diseases, as it is in some; but death seizes and carries him off in the prime of his days, and in the fulness of his strength; for no strength of man, even the greatest, is a security against death: thousands die before they come to their full strength, and multitudes after it begins to decay; and when it is almost wasted, through the force of distempers, or the…”

“Literally, "in the bone of his perfection," that is, the full strength of unimpaired prosperity [UMBREIT].”

“One dieth in his full strength - Margin, “very perfection,” or, “in the strength of his perfection.” The meaning is, that he dies in the very prime and vigor of life, surrounded with everything that can contribute to comfort. Of the truth of this position, no one can doubt; and the wonder is, that the friends of Job had not seen or admitted it. Being wholly at ease and quiet - That is, having everything to make them happy, so far as external circumstances are concerned. He is borne down by no calamities; he is overwhelmed by no sudden and heavy judgments. The phrase in this verse rendered “full strength” (תמו בעצם be‛etsem tômô), is literally, “in the bone of his perfection.” It means full…”

“in his full strength: Heb. in his very perfection, or, the strength of his perfection, Job 20:22, Job 20:23; Psa 49:17, Psa 73:4, Psa 73:5; Luk 12:19-21 Job 21:24”