How India will grow old over the next two decades.

[prope//er]

Some excerpts:
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Dr. P.N. Mari Bhat of Delhi University's Institute for Economic
Growth has laid out the implications of these discrepant patterns for
future aging in the supra-statal regions he labels "north India"
and "south India."19 Currently (2005), fertility levels for the
roughly half-billion population of this "north" are almost twice as
high as for the nearly quarter-billion people of this "south."
(India's remaining 350 million people live in states and union
territories not included in Mari Bhat's "north/south" analysis.)

By 2025, "north" India's population would still be very young.
Its projected median age would be just 26 - and the 65+ group would
account for less than 6 percent of total population. On the other hand,
"south" India's population structure in 2025 would bear
unmistakable signs of population aging. There, median age would be
about 34 (a level comparable to Europe's in the late 1980s), and 9
percent of the population would be 65 or older (about the same share as
Japan's in 1980).

Source:
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India: A tale of "two countries"
http://www.policyreview.org/136/eberstadt.html