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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Romans 6:23 For the wages of sin is physical death, and we all sin, and we all die, but the GIFT of God is eternal life, through Jesus Christ our Lord. Our physical bodies and our old nature can not be saved. Flesh and blood can not enter heaven. Only our soul/spirit is saved. I just turned 80 years old. My old physical body can not do the things it use to. But one day I will have a new body at the resurrection. First Corinthians 15:51-53 If I have died I will be raised from the dead, if I am alive, I will be transformed at the rapture of the church. From God’s word and the way the world is going, my wife and I both believe we may not have to die. The Lord is soon coming for us in the clouds to take His bride the church to heaven. First Thessalonians 4:13-18 We comfort one another with these words. There are signs in the heavens and on earth pointing to the rapture of the church. I am so ready. Things are being set up for the anti-Christ to set up his kingdom on earth. The 7-year tribulation.
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!
Being "born again" in John 3, refers to our spiritual rebirth in Christ when we accept Him as Lord and Savior of our lives and he comes to live in and, thereby, sanctify us (Gal 2:20). It has noting to do with the life spans of our physical bodies which science has shown is dictated to by the mutational load within us.
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