While about two-thirds of active federal employees are covered by the FERS system, the large majority of retirees are drawing benefits under CSRS, which is the older of the two systems. Those retired under CSRS will get the full adjustment, while those retired under FERS and who are eligible for COLAs—in most cases, not until age 62—will get 2.3 percent on their civil service benefits and 3.3 percent on their Social Security benefits. FERS employees who have a CSRS component to their annuities, typically those who transferred from CSRS to FERS during one of the open seasons for doing so, will get the full adjustment on the CSRS component. COLAs are pro-rated for those who retired, or will retire, during this calendar year.