In the article methodological approaches to population aging problems of several authors have been analyzed, and the most suitable method for Siberian regions has been chosen. In summation of several indexes and their dynamics from 2011 till 2017 the territories of Baikal region have been grouped by the United Nations scale and the index of aging of S. Bucher. Analysis of correlation of children up to 16 years old and people older 65 years old allowed to evaluate current demographical situation multilaterally. Aging level by the Nations scale shows increase of elderly people percentage in common population structure and leveling of Baikal region areas by aging level. Harsh differentiation of aging index of S. Bucher from 0,19 to 0,64 is detected, that composes more than 3,4 times. Average index meaning is 0,42, and it corresponds ahead of oldness. Among urban districts average aging index is 0,51, that is connected with lower birthrate and higher indexes of life expectancy. The reasons of population aging are emphasized: birthrate, mortality rate, migration of population on the municipal level. The author indicates an explicit role of the ethnic factor in the interregional differentiation of demographic aging, particularly, in Republic of Buryatia and in Ust-Ordyn Buryat District of Irkutsk Region.

Dmitrieva Yuliya Nikolaevna, Candidate of Sciences (Geography), Scientific Researcher, V. B. Sochava Institute of Geography SB RAS, 1, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation, tel.: (3952)42-62-20, e-mail: Yuliya.dmitr@mail.ru

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