The federal reserve chairman of the United States of America says that in theory "immigrants tend to be younger than the average population and have larger families, so they would help support older Americans who are withdrawing from the labor force." That's only in theory. We will need a whole bunch of'em so that an aging generation of Americans can feed of their backs, so immigration won't solve US aging problem after all. I never really thought about older American's living off the backs of working people, but now that you mention America’s Capitol City was built on the backs of slaves.