ABSTRACT
The article considers the process of population aging, which is evidently specific in economically developed countries for last quarter of the XX century. The increasing of population size older than able-bodied age in urban and rural population in the Irkutsk Oblast that is demonstrated by aging coefficient dynamic. In all studied territories increasing of this coefficient is revealed that characterizes transition of aging process in most areas of residence of urban and rural population to the level of III-IV stages (old and deeply old population). The dynamics of average age indicator is characterized by its stabilization at the level of stage II as aging population. The pensionary load on urban and rural population is increasing and it is higher in rural population. The increasing of this indicator is reflected in transformation of aging population (stage II) to old and deeply old population (stage III-IV). In most areas, coefficient of longevity is characterized by its increase in urban and rural population. The heterogeneity of aging differences between urban and rural population is smoothing out.