Psalm 21:4 records God granting the king length of days — the same petition for prolonged life as here.

Psalm 72:15-17 prays for the king's long life and enduring name — a very similar royal prayer for longevity.

Psalm 89:36 echoes the same covenant promise — the king's offspring and throne will endure forever, reinforcing the prayer for eternal years.

Psalm 89:37 continues the imagery of the throne established forever like the moon — a direct parallel to the prayer for the king's enduring life.

Psalm 21:7 describes the king's security through trust in God's steadfast love — the same basis for the prayer that his life be prolonged.

Isaiah 16:5 promises a throne established in steadfast love and faithfulness — themes closely tied to the king's enduring reign prayed for here.