Death on the new earth?!?

Isaiah 65:20 caught my attention again this morning. The chapter talks about the new heaven and earth and then verse 20 reads:

"No longer shall there be in it an infant who lives only a few days,
Or an old man who does not finish his days;
For the youth who dies at the age of a hundred,
And the one who does not reach the age of a hundred
Will be thought of as accursed."

This verse does indicate people dying.

But will there be death on the new earth if according to Rev 20:14 "...Death and Hades were thrown into the lake of fire. This is the second death, the lake of fire."?

Or does Rev 20:14 just indicate that the "lake of fire" now becomes the new "death"?

Along those lines comes Rev 22
"1 Then the angel showed me a river of the water of life—bright as crystal, flowing from the throne of God and of the Lamb
2 down the middle of the city’s street. On either side of the river was a tree of life, bearing twelve kinds of fruit, yielding its fruit each month; and the leaves of the tree were for the healing of the nations."

Food will be needed, but also healing. I can only assume that is refers to healing of the body as leaves are small and can't cover a nation...

My upbringing was in the church, so my thinking patterns was always according to what I was taught, but reading these verses side-by-side a different picture arises...

My thinking now is that if our bodies need healing then it must be possible to die as well according to Isaiah 20:14...

Or is my thinking way off track and I need to look at additional verses? If so, do you have other Scripture I can look at on this subject?