  Application of some basic notions and statistics of ageing distributions used
in mathematical theory of reliability including the Gini-type index is
discussed as a methodological tool for investigation of human population ageing
and longevity. In opposite to the traditionally used median and mean lifetime,
the GTI requires only one calendar year snap-shot data to reveal the population
ageing or rejuvenating. The case study illustrating the suggested techniques is
based on the Australia 1921 and Australia 2009 mortality data from the Human
Mortality Database (http://www.mortality.org)
