Population within any country is the centre figure that every planning or preparation should focuse in it, and to know what, how many you need in the future whether for long or short term governments must base on this element.
The example abouve shows the increasing of population of a country whthin 80 years and devide the population to three age groups.
The courve of people who their age less than 14 years old shows that : it constituted 30 percent of the total population in 1960 and then starts to decrease steedily to be 12 percent in 2020 and it will be 10 percent in the year 2040.
The midum group who contained people who their age is between 15 years to 64 years old it was constituted 55 percent in 1960 and reach 60 percent 1990 and then decreased to be 50 percent in 2020 and it will be 45 percent in 2040.
Thethird group that constitute people who their age over 65 years old was constited 30 percent in the year 1960 and then decreased steadily 20 percent in 1990 and will full down in 2040 to be 10 percent