Thou wilt prolong the king's life: [and] his years as many generations.
Ver. 6. Thou wilt prolong the king's life] The King Christ, saith the Chaldee, who shall see his seed, he shall prolong his days, and the pleasure of the Lord shah prosper in his hand, Isaiah 53:10. David himself also lived and reigned longer than most kings do, being old and full of days.
And his years as many generations] sc. In his sons and successors. So Psalms 72:17, Filiabitur heroine eius. The name of Christ shall endure for ever, it shall be begotten as one generation is begotten of another, there shall be a succession of Christ's name.