Isaiah 65:22:

They shall not build, and another inhabit; they shall not plant, and another eat: for as the days of a tree are the days of my people, and mine elect shall long enjoy the work of their hands.

Notes on Isaiah 65:22:

This verse is found in a passage that describes the new heavens and the new earth that God will create in the future.  While it is not a promise for present-day believers, I have included this verse in the list because it demonstrates that long life is something that happens when Jesus Christ reigns, as he will do during the Millennium described in this part of this chapter.