extreme "only bigots say 2+2=4" energy here https://twitter.com/les_ja/status/1323133581326127105 …pic.twitter.com/WPDsjtlCU8
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Population momentum is another factor, which takes decades to resolve.
Easy enough to model & visualize. (Post, maybe? 
)
(@morlockP's point, in simple terms, is that extending the lifetime of each cohort _temporarily_ masks the decrease in size of successive cohorts. But eventually the shrinking of cohorts beats the lengthening of lifetime.)
Toy model (80% shrinkage cohort size; one decade gained per cohort; jumps are b/c all die same time), red curve is the phenomenon described: lengthening lifetime hides the [massive] cohort shrinking. [Yep, I am a geek; I'm taking a break from… analyzing data, by making models!]pic.twitter.com/usJpYHdGzI
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