> Replace the 100 million value with 300, 400, 500, and my point isnt going to change
Your ratios are all wrong. There are about 500mm Indians aged 6 to 26 today who will be over 80 (and under 100) by 2100. Even if nobody dies, India isn’t hitting 1.2bn 80-year olds. As for under-18s in that timeline, it ranges from 100 to 500 million depending on fertility.
Put another way, there is no deterministic population collapse in India the way there almost must be in Korea and Germany.
Your ratios are all wrong. There are about 500mm Indians aged 6 to 26 today who will be over 80 (and under 100) by 2100. Even if nobody dies, India isn’t hitting 1.2bn 80-year olds. As for under-18s in that timeline, it ranges from 100 to 500 million depending on fertility.
Put another way, there is no deterministic population collapse in India the way there almost must be in Korea and Germany.