INTRO : The World Health Organization (WHO) defines life expectancy at birth as "the average number of years that a newborn could expect to live if he or she were to pass through life exposed to the sex- and age-specific death rates prevailing at the time of his or her birth, for a specific year, in a given country, territory, or geographic area." In simpler terms, it is the average number of years a person is likely to live in a country if the prevailing death rates at each age remain the same over time (Akande in Ogundepo 2025 ). The Organization for Economic Cooperation and Development (OECD) similarly defines life expectancy at birth as how long, on average, a newborn can expect to live, if current death rates do not change (OECD, 2020, as cited in Onwube et al., 2021) . Furthermore, Sede and Ohemeng (2015) described it as the measure of the length of life expected to be lived by an individual at birth. No wonder Sharma (2018) noted that it is the most widely used indi...