In a region, when the population is subdivided as per the age groups this is called the age structure of the population. Age structure is useful for the projection of population and for understanding the dynamics of the age structure arrangement. Similarly, it also helps in understanding the proportion of active and dependent population. In India, the productive population is the population between the ages. This group of people is active in service and business. They directly participate in the economic activities of a region. In regions where the proportion of this population is more, especially youth, development is rapid. The dependant population fall into two sub groups. The people below 15 years of age are totally dependent on the productive population. People above 60 years also fall in the dependant category but their knowledge and experience make them a valuable asset to the whole society. The population of a region can be classified into working an nonworking group. These people who are not in jobs or professions, despite being in the productive age group, come under the nonworking group. This nonworking group is dependant on the working group. If the proportion of working population is higher in a region then the population is termed as industrious. Such a region has repaid development.