John Gill Commentary Psalms 61:6

"Thou wilt prolong the king`s life; His years shall be as many generations." — Psalms 61:6 (ASV)

You will prolong the King's life
Or "add days to the days of the King" ^F1 . Meaning either himself, who, though his life was in danger by fighting with the Syrians and Edomites, or rather through the conspiracy of your son; yet was assured that he should yet live many years more, and especially in his posterity; and that his kingdom would be established for ever, as was promised him, (2 Samuel 7:12–16).

Or rather the King Messiah, so the Targum: and Kimchi observes, that if this psalm respects the captivity, the King is the King Messiah: it may be understood of his life as man; who, though he died, rose again, and lives for evermore; and that, as to the glory of God the Father, so to the good of his people, for whom he makes intercession; and of the continuance of his spiritual seed, in whom he may be said to live, and his days be prolonged, (Isaiah 53:10) ; and of the duration of his kingdom, of which there will be no end. For it is an everlasting one, as follows:

[and] his years as many generations ;
he living, and his posterity and kingdom continuing, age after age. The Targum is,

``his years as the generations of this world, and the generations of the world to, come.''

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FOOTNOTES:

• F1: (Pyowt Klm ymy le Mymy) "dies super dies regis adjicieo", V. L. Pagninus, Montanus