It sounds bad for India, but isn't really because birth rates have been in free fall (only since independence, no thanks to Britain) and have recently dropped below replacement [1]. In 4 decades or less, the population will peak and start decreasing.

India can reap the benefits of the demographic dividend, but it remains to be seen if it actually will...

https://www.gapminder.org/tools/#$model$markers$line$data$fi...