"This paper addresses the issue of a model for the total lifespan survival curve, with particular interest in the later life or geriatric years. This new model is based upon the basic premise that the population under study is a mixture of individuals comprising three major subgroups: (1) neonatal deaths, (2) standard Gompertzian-like survival, (3) geriatric survival.  It is demonstrated that a standard mixture model, mixing three survival distributions, more than adequately describes survival over the entire lifespan of the population.  Further, this newer model has the desirable added virtue that the model parameters may be interpreted in a biological manner."