The boomers pretty clearly want a 20-year paid vacation on the backs of everyone else. I’m not sure how the working class pays for half the population to do that.
But pensions on the other hand usually involve some sort of government system which often ends up trapped by demographic swings. The key for a pension system is this: don't allow it to depend on demographics. Make sure each generation provides for it's own pensions.
I used food above, but lots of other things likewise need current work. You cannot retire and sit on a log watching birds, you need to get lots of things from society.
Just storing value as cash just means that you have a greater claim to the productivity of a given society than other people, it doesn't necessarily "grow the pie".