The "help" goes beyond taking care of themselves. What about food, clothing, infrastructure maintenance, and so on? An inverted population pyramid requires massive increase in the productivity of the economically active part of the population.
It's also something we could help by getting rid of zoning in cities, of course, because we constantly push low income elderly out to the edges of urban areas where they can afford to live, rather than allowing supply to keep up with demand in dense, walkable, accessible places where people who can't drive can actually have quality of life.