. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Definition and Measurement of Senescence 7 can yet claim causal precedence over any other, and we must therefore try our luck elsewhere. The Actuarial Measurement of Senescence The actuarial measurement of senescence is based upon the following presupposition: that although senescence is indeed a diverse and complex process, with manifestations in all the structures and activities of the body, its net total age in years Fig. 1. effect is of one measurable kind—to increase vulnerability, the lik
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Definition and Measurement of Senescence 7 can yet claim causal precedence over any other, and we must therefore try our luck elsewhere. The Actuarial Measurement of Senescence The actuarial measurement of senescence is based upon the following presupposition: that although senescence is indeed a diverse and complex process, with manifestations in all the structures and activities of the body, its net total age in years Fig. 1. effect is of one measurable kind—to increase vulnerability, the likelihood of dying, as life goes on. A measurement of vulnerability is implicit within the information set out in an actuary's life table. A life table may be thought of as a series of figures representing the sur- viving residue, year by year, of a population marked at birth and followed through life until all have died. The table there- fore begins with some arbitrary but large number of indivi- duals (Z^,, say 100,000) and ends at zero when none survive. In the form of a graph, a life table for human beings has the shape illustrated by Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward). Boston, Little, Brown
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