The IRS web site has  helpful tips for seniors and individuals on disability.

Standard Deduction for Seniors - If you do not itemize your deductions, you can get a higher standard deduction amount if you and/or your spouse are 65 years old or older. You can get an even higher standard deduction amount if either you or your spouse is blind. (See Form 1040 and Form 1040A instructions.)

Taxable Amount of Social Security Benefits -When preparing your return, be especially careful when you calculate the taxable amount of your Social Security. Use the Social Security benefits worksheet found in the instructions for IRS Form 1040 and Form 1040A, and then double-check it before you fill out your tax return. See Publication 915, Social Security and Equivalent Railroad Retirement Benefits.

Credit for the Elderly or Disabled - You must file using Form 1040 or Form 1040A to receive the Credit for the Elderly or Disabled. You cannot get the Credit for the Elderly or Disabled if you file using Form 1040EZ.