My money is on Kessler Syndrome in less than 20 years.
Thedogdrinkscoffee
I'm not keen on a society dominated by resource exhaustion, grossly exceeded planetary boundaries leading to ecological overshoot and collapse and billions of early deaths due to climate change, pollution and conflict as everyone fights for whatever is left.
An againg society is a necessary step towards a sustainable population. Anything other than a sustainable population (number of people x consumption amount) will, by definition, not be sustained. A collapse will be chaotic and devastating. A managed descent of degrowth will have difficulties but could save humanity and the biosphere as we know it.
I was going to say "No one is saying that", but there are many going down that road.
The preferable approach is degrowth. A lower birthrate leading to a smaller population with no deaths required, just vastly fewer births and lower consumption until human civilization can not only fit with our planetary boundaries, but restore a lot of wildlife and wildlands, then stabilize at a population and consumption that is healthy and comfortable.
I don't want my children or anyone elses to take care of me, or other old folks. No one should place that burden on our youth. When it's time, its time. I'm reminded of a friend who had to take leave off work because his dad was in a home and couldn't feed himself and they had insufficient staff to care for the old folks feedings and washings. What a disgusting way to live. I'll never be that burden on anyone.
I'll take care of myself and when I can't do that anymore I'll take care of myself. ಠ_ಠ
With any luck, society will learn sensible limits to eldercare.
This has been used to justify every egregious behaviour by boorish groups throughout history.
Don't normalize cruelty. Don't be that guy.