Given that older people tend to be more conservative?
Its very possible its just a boomer thing, but there are similar trends happening in various places. I've heard that the US and Japan have the same phenomenon amongst whites and asians respectively, but don't quote me on that.
My pessimistic side tells me its people reproducing less. Could be economic stress, drug induced, internet changing behavior, or just some quirk of social behavior.
Are you familiar with John Calhoun's mouse experiments? He did some crazy research in a effort to model how civilizations fall, and one of his key findings was that when a population of mice is given everything they need to survive, they will eventually just stop reproducing. If you're interested, this is a great summary of his work: https://hooktube.com/watch?v=NgGLFozNM2o
Yes I have read about the mouse uptopia experiment series.
They say its gone over to the older age bracket but they are encouraging older Australians to continue working, currently phasing in a new standard retirement age of 70.
I do wonder if it could be a bulge due to the baby boomer population and not a permanent thing as they are suggesting in the article.