Baudisch, AVaupel, JW2017-06-022017-06-022010-11-10https://hdl.handle.net/10161/14786Humans, and many other species, suffer senescence: mortality increases and fertility decreases with adult age. Some species, however, enjoy sustenance: mortality and fertility remain constant. Here we develop simple but general evolutionary-demographic models to explain the conditions that favor senescence vs. sustenance. The models illustrate how mathematical demography can deepen understanding of the evolution of aging. © 2010 Annette Baudisch & James W. Vaupel.Journal article1435-9871