You do know that corporate profits are literally where old people get their money, right?

Take the posterchild of capitalism as an example, the US. People over 55 own 52% of all assets, from money to homes to companies. As a group they outweigh the billionaire class about 8 to 1 by wealth (and of course most billionaires are themselves also old). That's how retirement investments work, you live off the backs of young people who work.

Get rid of capitalism, you just get a different way to route young people's productivity to old people. Hell, get rid of currency and it doesn't change. Everyone's producing food and goods, but a large share of it goes to people who are old and no longer work. The larger the share of people not working, the larger the burden on the people not working.

Unless the population is constantly growing, retirement is a burden on young people regardless of economic system.