Title: Special Retirement Supplement (FERS Supplement) Fact Sheet
Article Snip: "...The special retirement supplement (also known as the FERS supplement) is unique to FERS. It substitutes for the Social Security part of your total FERS benefit until age 62, when most people become eligible for Social Security. The purpose of the supplement is to provide a level of income before age 62 similar to what you will receive at age 62 as part of a Social Security benefit... The eligibility requirements are..."
Reference: Federal Retiree