4 He asked you for life, and you gave it to him— length of days, for ever and ever.

Read Psalm 21:4 Using Other Translations

He asked life of thee, and thou gavest it him, even length of days for ever and ever.
He asked life of you; you gave it to him, length of days forever and ever.
He asked you to preserve his life, and you granted his request. The days of his life stretch on forever.