Every country in the world experiences the benefits of its demographic dividend, a period that comes but once in the life of a nation-when the share of the working-age population is larger than the non-working-age share. It has the potential to make a country progress towards higher incomes and development. But it can also become a nightmare if there aren't enough jobs. India entered this period in 1980, and by the time it ends in 2040, ours...