Not so fast.. What income do you have now? If your only income was Social Security --- then you are correct-- you do not need to file. But if you have any other income like a pension, investment income, distributions from an IRA or 401k, etc etc. you might still need to file a tax return.
Who has to file?
http://www.irs.gov/uac/Do-I-Need-to-File-a-Tax-Return%3F