*Minor differences ignored. Grouped by changes, with first version listed as example.
Cast me not off in the time of my old age. David having just now declared that God had been the protector of his life at his birth, and afterwards his foster-father in his childhood, and the guardian of his welfare during the whole course of his past existence; being now worn out with age, casts himself anew into the fatherly bosom of God. In proportion as our strength fails us -- and then necessity itself impels us to seek God -- in the same proportion should our hope in the willingness and readiness of God to succor us become strong. David's prayer, in short, amounts to this: "Do thou, O Lord, who hast sustained me vigorous and strong in the flower of my youth, not forsake me now, when I am decayed and almost withered, but the more I stand in need of thy help, let the decrepitude and infirmities of age move thee to compassionate me the more." From this verse expositors, not without good reason, conclude that the conspiracy of Absalom is the subject treated of in this psalm. And certainly it was a horrible and tragical spectacle, which tended to lead, not only the common people, but also those who excelled in authority, to turn away their eyes from him, as they would from a detestable monster, when the son, having driven his father from the kingdom, pursued him even through the very deserts to put him to death.
Cast me not off in the time of old age - When old age comes with its infirmities; its weaknesses; its trials. When my strength fails me; when my eyes grow dim; when my knees totter; when my friends have died; when I am no longer able to labor for my support; when the buoyant feelings of earlier years are no more; when my old companions and associates are gone, and I am left alone. Thou who didst watch over me in infancy; who didst guard me in childhood and youth; who hast defended me in manhood; who hast upheld me in the days of sickness, danger, bereavement, trouble - do thou not leave me when, in advanced years, I have special need of thy care; when I have reason to apprehend that there may come upon me, in that season of my life, troubles that I have never known before; when I shall not have the strength, the buoyancy, the elasticity, the ardor, the animal spirits of other years, to enable me to meet those troubles; and when I shall have none of the friends to cheer me whom I had in the earlier periods of my course. It is not unnatural or improper for a man who sees old age coming upon him to pray for special grace, and special strength, to enable him to meet what he cannot ward off, and what he cannot but dread; for who can look upon the infirmities of old age as coming upon himself but with sad and pensive feelings? Who would wish "to be" an old man? Who can look upon a man tottering with years, and broken down with infirmities - a man whose sight and hearing are gone - a man who is alone amidst the graves of all the friends that he had in early life - a man who is a burden to himself and to the world, a man who has reached the "last scene of all, that ends the strange eventful history," that scene of
"Second childishness and mere oblivion,
Sans teeth, sans eyes, sans taste, sans everything," -
That scene when one can say,
"I have lived long enough; my way of life
Is fallen into the sear, the yellow leaf;
And that which should accompany old age,
As honor, love, obedience, troops of friends,
I must not look to have,"
Who can think of all this, and not pray for special grace for himself should he live to see those days of infirmity and weakness? And who, in view of such infirmities, can fail to see the propriety of seeking the favor of God in early years? Compare Ecclesiastes 12:1-6.
Forsake me not when my strength faileth - As I may expect it to do, when I grow old. A man can lay up nothing better for the infirmities of old age than the favor of God sought, by earnest prayer, in the days of his youth and his maturer years.
Cast me not off in the time of old age - The original might be translated and paraphrased thus: "Thou wilt not cast me off till the time of old age; and according to the failure of my flesh, thou wilt not forsake me." My expectation of rest and happiness will not be deferred till the time that I shall be an aged man, Thou wilt not withdraw thy presence from me as my flesh decays, and as my natural strength abates; but, on the contrary, as my outward man decays, my inward man shall be renewed day by day. It was in David's old age that the rebellion of Absalom took place.
Cast me not off in the time of (g) old age; forsake me not when my strength faileth.
(g) You who helped me in my youth when I had more strength, help me now even more in my old age and weakness.
Cast me not off in the time of old age,.... The Lord never casts off nor casts away his people, whom he foreknew; they are near unto him; they are on his heart, and are engraven on the palms of his hands; and they shall never be removed from his heart's love, nor out of his arms, nor out of his covenant, and shall always be the objects of his care: he bears and carries them to old age, and even to hoary hairs: the Lord had been the guide of David's youth, and his trust then, Psalm 71:5; and now he desires he would be the staff of his old age; at which age he was when Absalom rebelled against him;
forsake me not when my strength faileth: as it does when old age comes on; then the keepers of the house tremble, and the strong men bow themselves, and especially at death, when flesh and heart fail; but God will never forsake his people, neither in youth nor in old age, neither in life nor at death.
*More commentary available at chapter level.