From gas to health care, prices are rising, and while some costs may come back down, retirees need to prepare for fluctuating expenses in retirement . After all, it wasn't too long ago that inflation was around 8%. Sure, your Social Security benefits will keep up with the pace of inflation, but your retirement savings, pension and other income won't, which can significantly affect your retirement lifestyle. "Inflation is something that is constantly changing," said Chandler Riggs , CFP, VP and financial consultant at Fidelity Investments. As a result, "it should be a concern to retirees." From just $107.88 $24.99 for Kiplinger Personal Finance Become a smarter, better informed investor. Subscribe from just $107.88 $24.99, plus get up to 4 Special Issues CLICK FOR FREE ISSUE Sign up for Kiplinger’s Free Newsletters Profit and prosper with the best of expert advice on investing, taxes, retirement, personal finance and more - straight to your e-mail.…