Birth rate: the ratio of live births in a specified area, group, etc, to the population of that area, etc, usually expressed per 1000 population per year.
Death rate: the number of deaths per unit, usually 1000, of population in a given place and time.
Natural increase: How much a country is growing.
Infant mortility rate: The death rate of infants during the first year of life.
Life expectancy:The number of years that an individual is expected to live
Birth control: Voluntary prevention of conception by a man or a woman
Family planning: The planning of when to have children.
Fertility rate: The average number of children that would be born to a woman over her lifetime.
Ageing population: When the median age of a country or region increases.