NRA stands for "Normal Retirement Age" and is often referred to by Social Security as the "Full Retirement Age." The age at which a worker may receive full retirement benefits is called the full retirement age. Full retirement age, also called normal retirement age, determines when you can receive your full retirement benefit. If a worker wants to begin to receive retirement benefits earlier, his benefit will be a reduced percentage of the amount he would have received if he had waited to his full retirement age to begin receiving benefits.