Consider the following statements regarding India's demographic trends:

I. Demographic dividend refers to the economic growth potential arising from a declining dependency ratio, due to a rising working-age population.

II. Demographic winter refers to the economic and social challenges arising from an increasing working-age population and decreasing old-age dependency.

III. India is expected to enjoy its demographic dividend till the mid-21st century, and its realization depends on education, skill development, health, and employment generation.

Which of the above statements are correct?