Psalms 71:18

“Now also, when I am old and grayheaded, O God, forsake me not, etc.] A repetition of his request, (<197109>Psalm 71:9); with a reason annexed to it, suggested in the following words: until I have showed thy strength unto [this] generation; or, “thine arm” f968 ; which sometimes the Messiah, (<235301>Isaiah 53:1); who is the power of by whom he made the worlds, and in whom all things consist; and who has wrought out the salvation people; and is the arm on which they lean, and they are upheld. And the psalmist may be thought to desire that he might be continued a little longer, and be favoured with the presence of God, and the influences of his Spirit and grace; that he might show forth in…”

“Now also when I am old and grey-headed - Margin, “unto old age and grey hairs.” This does not necessarily mean that he was then actually old and grey-headed, but it would imply that he was approaching that period, or that he had it in prospect. The time of youth was past, and he was approaching old age. The literal rendering would be, “And also unto old age and grey hairs, do not forsake me.” This is the prayer of one who had been favored in youth, and in all his former course of life, and who now asked that God would continue his mercy, and not forsake him when the infirmities of age drew on. Forsake me not - Still keep me alive. Give me health, and strength, and ability to set forth thy…”

“Now: Psa 71:9; Gen 27:1; Sa1 4:15, Sa1 4:18; Isa 46:4 when I am old and greyheaded: Heb. until old age and grey hairs until I: Psa 78:4, Psa 78:6, Psa 145:4, Psa 145:5; Exo 13:8, Exo 13:14-17; 1Chr. 29:10-30; Act 13:36 strength: Heb. arm, Isa 51:9, Isa 53:1 Psalms 71:19”