Devalue our currency by some amount by printing money over time? I'm not being glib. The effects:

Makes debt and social security obligations smaller by paying the dollar amounts, but with less expensive dollars.

Force boomers to work well into retirement which is set based on a shorter life expectancy anyway.

Reduce our debt to china.

There are plenty of bad effects, but it seems the easiest thing to put over on the people, because all the other hard decisions would be politically unpalatable. Aside from this, the current course seems to make it inevitable.