3. Date of birth ____
Age
Age is one of the two basic biosocial characteristics of each human individual (in addition to gender).
Age structure
It represents the division of the population according to age into one-year or multi-year groups. Usually these are five-year age groups; i.e. 0- to 4-year, 5- to 9-year, 10- to 14-year, etc.), but also others, e.g. 99 +- year, or 60 +- year, 80 +- year, etc.
The main age groups are defined according to the relation of the population to economic activity, by approximating age limits to the potential beginning and the potential ending of their economic activity.
According to the relation to economic activity we distinguish the following groups: