Uhm. Nobody dies in the new heavens and new earth.
Right. But, Isaiah 65:20 clearly relates to the new heavens and new earth, so why do you not take what you said here into account when interpreting it? All of this is about the new heavens and new earth:
Isaiah 65:20 “See,
I will create new heavens and a new earth. The former things will not be remembered, nor will they come to mind. 18 But be glad and rejoice forever in what I will create, for I will create Jerusalem to be a delight and its people a joy. 19 I will rejoice over Jerusalem and take delight in my people; the sound of weeping and of crying will be heard in it no more. 20 “Never again will there be in it
an infant who lives but a few days, or an old man who does not live out his years; the one who dies at a hundred will be thought a mere child; the one who fails to reach a hundred will be considered accursed.
What you're not understanding is that Isaiah was speaking figuratively here about eternity in a way that people back then could understand.
There is no death there at all. It's talking about the Millenial Kingdom which transpires before the new heavens and new earth.
So, when someone dies during this supposed future Millennial Kingdom, no one will mourn for them?
Isaiah 65:19 I will rejoice over Jerusalem and take delight in my people;
the sound of weeping and of crying will be heard in it no more.
I assume you believe this verse, which obviously comes right before Isaiah 65:20, relates to the supposed future Millennial kingdom?
No more weeping and crying. Where else does scripture talk about that?
Revelation 21:1
Then I saw “a new heaven and a new earth,” for the first heaven and the first earth had passed away, and there was no longer any sea. 2 I saw the Holy City, the new Jerusalem, coming down out of heaven from God, prepared as a bride beautifully dressed for her husband. 3 And I heard a loud voice from the throne saying, “Look! God’s dwelling place is now among the people, and he will dwell with them. They will be his people, and God himself will be with them and be their God. 4 ‘
He will wipe every tear from their eyes. There will be no more death' or mourning or crying or pain, for the old order of things has passed away.”
John made it clear that at the point when there's no more mourning or crying there will also be no more death. Why wouldn't you take this into account when interpreting Isaiah 65:17-25? Surely, there will not be two new heavens and new earths, so we need to interpret Isaiah 65:17-25 and Revelation 21:1-4 in such a way that doesn't make them contradict each other. You're not doing that.