I blogged previously worrying about the impact of inflation, if it occurs, on people on fixed incomes.
I've a second thought--it may be true that since the inflation of the 1970s that use of inflation-indexing has increased. IIRC it once was true that Congress would pass legislation increasing social security payments (also reducing income tax rates) to compensate for inflation. These days both are indexed, so the impact on the elderly may be less.