1. J. W. Vaupel is at the Max Planck Institute for Demographic Research, D-18057 Rostock, Germany; Odense University Medical School, DK-5000 Odense C, Denmark; the Center for Demographic Studies, Duke University, Durham, NC 27706, USA; and Andrus Gerontology Center, the University of Southern California, Los Angeles, CA 90089–0191, USA. J. R. Carey is in the Department of Entomology, University of California at Davis, Davis, CA 95616–8584, USA. K. Christensen, N. V. Holm, I. A. Iachine, and V. Kannisto...