Srinivas Goli, associate professor in demographics at the IIPS, Mumbai: “The same amount of fertility transition - that is to come down from six children to 2.1 children per female adult - France took 285 years, England took 225 years, whereas India took just 45 years. The only country which took less time to reach this fertility transition is China”
https://indianexpress.com/article/political-pulse/elderly-rising-lower-fertility-rates-andhra-tn-m-k-stalin-children-9632386/