Passage
I will fill him with length of days; and I will shew him my salvation.
I will fill him with length of days; and I will shew him my salvation.
Psalms 90:14 Because he hoped in me I will deliver him: I will protect him because he hath known my name.
Psalms 90:15 He shall cry to me, and I will hear him: I am with him in tribulation, I will deliver him, and I will glorify him.
Psalms 90:16 I will fill him with length of days; and I will shew him my salvation.
The verse centers on "fill", "length", "days", "shew", and "salvation". It is saying that the verse draws attention to "fill" and "length", so its meaning should be read from those terms before moving to application.
The prior verse says "He shall cry to me and I...", giving immediate footing for "fill" and "length". In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "fill" and "length" with trust shaped by these words, not by a vague optimism outside the passage.