<prompt> Denominator in dependency ratio ?Age group 15 yearsAge group 15-65 yearsAge group 65 years15 years and 65 yeas  <response>: Ans. is b i.e., Age group 15-65 years Dependency ratio The propoion of persons above 65 years of age and children below 15 years of age are considered to be dependent on the economically productive age group 15-64 years. The ratio of combined age group 0-14 years plus 65 years and above to the 15-65 years age group is known as total dependency ratio. 