INFLUENCE OF CHANGES IN THE REPRODUCTIVE BEHAVIOR ON THE AVERAGE DURATION OF THE REPRODUCTIVE PERIOD AND LIFE SPAN
This article explains the model of changing the duration of the reproductive period and life span under the inﬂuence of the demographic trend towards an increase in age at ﬁrst birth in modern developed countries. Acting as a factor of artiﬁcial selection, increase parental age may lead to a shift of the upper boundary of the reproductive period in the new generations, and life expectancy. The article discusses the role of a number of social factors to identify trends.