In Canada, the working age population is massively subsidizing the older generation already, while getting fucked by them on the cost of shelter, and from every direction on the cost of basic necessities compared to income. There's fewer working age people per old age security and CPP recipient than ever, and it's our federal government's largest line items. An average 30 y.o in a population centre probably makes substantially less then the average retiree would have ever made, pays them more rent they'd ever have imagined, and pays most of their taxes directly into that hypothetical landlord's pocket. It's crazy and idk wth is going to happen because also there's almost no jobs available or clear upward mobility/stability, all of that shit went out the window long ago unless you're in a trade union already with a decade of experience, or just lucky.
This will keep getting worse if birth rates remain low. It’s one of the biggest negative social consequences from a far below replacement rate birth rate. Immigration can make up some of it but there are limits to immigration rate before it causes other problems and provokes a generally very right wing populist backlash.
It's also a circular negative feedback loop until it gets balanced out. Imo, below replacement birthrates can be thought of as "getting worse", but they're skewed by a narrow window of immense prosperity and wealth that was basically fabricated, and could thus be the rebalancing, of governments let them. Less prosperity for a whole generation of people that effectively make up the future market for overvalued static assets, means there is hypothetically a ceiling, likewise if the population is only inflated by economically low-value immigration; if systems are working,(they're not) then there simply won't be enough domestic money flowing around to keep supporting that type of hockey stick growth. That's my theory anyway
[0] https://www.gensqueeze.ca/analysis_2023_federal_budget