The population consists of individuals that differ among themselves by sex (male and female) and age (rudiments, newborns, young, adults and old). On a certain territory, all the diversity of such individuals in the population forms groupings of a special composition and with special functions. Taken together, they all represent a single whole, since they are interconnected by a complex system of interactions and interdependencies.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.