Census of India released its year-wise age data from 2011 last Friday. Data is available for India and all states. The Transition State takes a look at how India and its states have been ageing.
The median age of India in 2011 was a young 24 years, with the median age ranging from 19 years in Meghalaya, 20 in Bihar and UP to 31 years in Kerala. This is good news for India as even it’s most aged state is still younger than China or the United States. Below is a map of median ages of individual states.
What the above spread of values also shows is that India’s youngest states could be as much as 25 years behind its most aged states in terms of their demographic profiles. In theory, this gives states a good amount of time to learn from each other’s employment and economic policies to do their best in taking advantage of the upcoming ‘demographic dividend’.
Plenty has been said about the idea of a demographic dividend that India needs to take advantage of. I will just reprint an excerpt from a good article by Kaushik Basu several years ago on the subject:
In the year 2004 India had a population of 1,080 million, of whom 672 million people were in the age-group 15 to 64 years. This is usually treated as the “working age population”. Since outside of this age group very few people work, it is reasonable to think of the remainder, that is, 408 million people, as the “dependent population”.
A nation’s “dependency ratio” is the ratio of the dependent population to the working-age population. In the case of India this turns out to be 0.6.
What is different about India is the prediction that it will see a sharp decline in this ratio over the next 30 years or so. This is what constitutes the demographic dividend for India. [Kaushik Basu, BBC]
If we plot the working age population (anyone between the ages of 15 and 64) versus the median age, what we get is a tight correlation between the two. This implies that most Indian states are yet to reach their maximum working age population ratios. The possible exception to this might be Kerala, which might have already peaked.
The age structure profiles of Bihar, India and Kerala also illustrate the different stages of demographic development India’s states are: from a very young, bulging child population in Bihar to a more youth/young-adult heavy national population, to a far older population in Kerala.
If you were wondering what those spikes in the above graphs were, it pays to remember that the Census records reported ages and not actual ages. Ordinarily, such age structures must be quite smooth if accurate – there is no cause for spikes unless for some strange reason people decided to have a lot more kids in a particular year. Usually one member of a household (who is at home) is asked to provide the age of everyone in that household – and predictably, certain numbers get rounded up.
The graph below shows you that people round up ages to numbers 10, 12,18, 20 and every subsequent multiple of five. Curiously enough, the mis-reporting of ages is much lower in Kerala than the rest – showing that the state’s higher literacy has at least resulted in people knowing the age of their immediate relatives a lot better.
Addendum. Census of India also released their own presentation on the age data on their website today. However, many of the numbers that they have put up (like % people in working age population) do not match up with what can be calculated from the raw data. (Hat-tip to Rukmini Srinivasan for directing me to it.)