We are not living in longer today than believers in King David’s time, but we have Jesus living in us by his Holy Spirit.
ESV - 10 The years of our life are seventy, or even by reason of strength eighty; yet their span is but toil and trouble; they are soon gone, and we fly away.
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The "threescore-and-ten" reference to the "normal" human life span in the cited psalm goes back even farther than David, since Psalm 90 (according to the Bible) was written by Moses. (However, Moses himself also lived to be 120 years old, as noted in Deuteronomy 34:7.) That would therefore seem to be (and also to have been for some time) a more-or-less "fixed" consequence of living in this current fallen world, regardless of the spiritual state of each individual believer. As indicated in the question, Christians have been born again, and have the indwelling Holy Spirit. However, I would say that, while Christians should endeavor to take care of their health and bodies, so that they can use any added length of life derived from that effort in God's service, the fact that they have been freed from the fear of death by Christ's example could (or even should) also (as it did with Paul in Philippians 1:21-23) create the actual desire to depart (or at least to be ready at all times to depart) this earthly life in order to be with Christ, which Paul described as a "far better" state -- and one that will last not just for a limited length of time, but forever!
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