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Age- sex structure is one of the most important characteristics of population composition. Almost all population characteristics vary significantly with age. Age statistics form an important component of population analysis, as most of the analysis is based on age-sex structure of the population. The usefulness of age data is more noticeable when it is cross classified by variables like marital status, literacy educational attainment, economic activity which vary with age in different patterns. Apart from purely demographic concerns, the age- sex data structure is required for age specific analysis of data for planning, scientific, technical and commercial purposes. The dependency ratio, which is the ratio of economically active to economically inactive persons, is dependent on age composition. India has one of the largest proportions of population in the younger age groups in the world. 35.3% of the population of the country has been in the age group 0-14 years at the Census 2001. 41% of the population account for less than 18 years of age. Census 2001 data on marital status of persons show that out of over a billion population of the country, 513 million (49.8%) have reported ad �Never married�, mainly due to high proportion of young people. The �Married� constitute about 45.6% of the total population.