No one will grow frail by becoming old in the New Jerusalem. Citizens of the new earth will experience and enjoy both wholeness of body and longevity of life. They will have a quality of life unrestricted by disability or disease. To live in the New Jerusalem is to experience life in all its fullness and vitality. It is to live as one has never lived before. It is to be in the prime of life, for the whole of one's life.
--T. Desmond Alexander, From Eden to the New Jerusalem: An Introduction to Biblical Theology (Kregel 2008), 156