India has its largest-ever working-age population, offering a once-in-a-generation opportunity to drive economic growth. India's population story begins with the world's biggest crowd, but that’s just the opening chapter!Home to more than 1.4 billion people, India had long overtaken China to become the world's most populous country. Now, the demographic journey is no longer just about size, rather about where people are moving, how they're living, how long they're living.Now, while China is aging at a rapid pace, India is in the prime of its demographic youth.The country has its largest-ever working-age population, offering a once-in-a-generation opportunity to drive economic…