By James L McGaugh and Sara B. Kiesler (Eds.)
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Additional resources for Aging. Biology and Behavior
He has organized an impressive argument suggesting that time-dependent changes in neural, endocrine, and target-tissue interactions can lead to senescence by creating an imbalance of proper neuroendocrine control processes. In effect this would create a so-called regulatory cascade of hormonal imbalance, much in the same manner as suggested by Dilman and Everitt. The major criticism I find with Finch's hypothesis is that he has failed to describe a specific mechanism that could lead initially to the regulatory cascade and also why different species have different maximum life-span potentials.
Albumin, transferrin, and DNA phylogeny of monkeys, apes, and human beings. The numbers refer to immunological distance of albumin, transferrin, and DNA in that order. (From Sarich and Cronin 1976, p. ) 22 SHERWOOD L. ). Paleontologists put the separation at 20-40 million years. Fossils are too few and fragmentary to settle the issue. Since the life-span is approximately the same in the orangutan and the African apes, it is possible that the common ancestor of human beings and apes had a comparable longevity.
Death rates were very high in the first 4 years, then low until the middle twenties, then slowly increasing, until there are few survivors after 45. There were local exceptions to the general situation. For example, Laughlin (1972, p. 7). 6 Length of Life in Precontact American Indians: Libben Site0 Years Skeletons Percentages 0-5 6-15 16-25 26-35 36-45 46Totals 513 186 141 269 147 _33_ 1289 40 14 11 21 11 3 100% a From CO. , Paleodemography of the Libben Site, Ottawa County, Ohio, Science 198: 291-293.