More than 50% of India's population is now 25 years or older, according to a latest survey.
People under the age of 25 years constitute 46.9% of the country's population, said recently released Sample Registration System 2018, prepared by the Registrar General and Census Commissioner of India.
The population under 25 years of age includes 47.4% male and 46.3% female.
However, in states like Bihar, Uttar Pradesh and Kerala, the population under this age bracket is marginally higher than the national average.
With the highest fertility rate of 3.2%, Bihar has the highest proportion of its population below 25 years of age at 57.2%.
Uttar Pradesh has 52.7% of its population under 25 years of age. It has the second-highest fertility rate in the country at 2.9%.
With a fertility rate of 1.7%, Kerala has 37.4% of its population aged below 25 years.
The fertility rate is measured on the basis of the average number of children per woman.
Due to a low fertility rate in urban areas, the population under the age of 25 years is less there as compared to rural areas.
Bihar has the highest birth rate at 26.2% and Andaman and Nicobar Islands the lowest at 11.2%. Chhattisgarh has the highest death rate at 8% and Delhi the lowest at 3.3%.
The birth rate is calculated per one thousand of the population.
The death rate in India has witnessed a significant decline over the last four decades from 14.9%in 1971 to 6.2% in 2018.
The decline has been steeper in rural areas. In the last decade, the death rate has declined at an all-India level from 7.3% to 6.2%.
The corresponding decline in rural areas is from 7.8% to 6.7% and in urban areas from 5.8% to 5.1%.
The birth rate is a crude measure of fertility of a population and a crucial determinant of population growth. India's birth rate has declined drastically over the last four decades from 36.9% in 1971 to 20.0% in 2018.
The rural-urban differential has also narrowed.
However, the birth rate has continued to be higher in rural areas compared to urban areas in the last four decades.
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