When did India enter the demographic dividend opportunity window, according to the Economic Survey 2018-19?

According to the Economic Survey 2018-19, India entered the demographic dividend opportunity window in 2005-06. This period is characterized by a larger proportion of the working-age population (15-64 years) relative to the dependent population (children and elderly), providing a "window of opportunity" for increased productivity and economic growth. The demographic dividend represents a crucial phase for a country like India to harness its economic potential through appropriate policy measures that boost employment, investment in human capital, and supportive economic reforms. This window is projected to remain open until 2055-56, offering India a significant span to leverage its young population for sustainable economic development.