More on the Mortality Conjecture: The Components of Demographic Mortality

In a previous preprint article, the author presented a conjecture on the trend of demographic mortality as the life span progresses. That article also provided a mathematical formulation of the statistical distribution to which mortality would tend in this case. In the present work, we show the possibility that the demographic mortality at high ages would be given by the sum of four main components. The four components were derived by iteratively solving the Fredholm equation that can be associated with the model. These solutions are presented for three demographic cases based on statistical data available in the public databases and literature. These are: mortality data in the US from 1970 to 2017, in Italy from 1974 to 2019 and in Japan from 1974 to 2019. In all cases, similarities and invariant components are noted and presented in graphs and numerical data. The four aforementioned components appear on average equally spaced in the age peaks (in the case of females ~50, ~63, ~77, ~90 ages) and are always present for all sample years and in all three countries. These same components can be used to reconstruct the qx datum, at advanced ages, of the considered Life Tables. A correlation with a more recent study using a multi-omics approach is pointed out.