the mortality rate plateau presents the intriguing possibility that improving health is possible at any age. And we are just starting to understand just how malleable lifespan—and healthspan—might be.

NOTES

  

1. J. R. Carey, P. Liedo, D. Orozco, and J. W. Vaupel. Slowing of mortality rates of older ages in large medfly cohorts. Science 258(1992):457-461.

  

2. J. W. Curtsinger, H. H. Fukui, D. R. Townsend, and J. W. Vaupel. Demography of genotypes: Failure of the limited life span paradigm in Drosophila melanogaster. Science 258(1992):461-463.



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