The inverted pyramid social security system

With the decline in the young population, Japan is heading towards an inverted pyramid. As long as we rely on them for social security capital, the age at which people start receiving benefits will eventually exceed the average life expectancy. Is a society in which the elderly, the wealthy, institutional investors, and other capitalists can invest in the younger generation and mutually enjoy the benefits merely a pipe dream? In fact, such a social structure has already been realized in the digital world. This is not a simple redistribution of wealth, but a sustainable capital circulation society.