They could raise the age limits to 75+? Wonder how much impact that would have.
They don’t need to raise the age limit to 75+. Seventy will do quite nicely, along with some other tinkering:
http://www.jeffjacoby.com/3421/how-to-fix-social-security
I certainly do not know the economics of your suggestion. However, I imagine that such an action would require Congress to muster up some courage.....which, IMO, is a long shot. ;-)