Your Full Retirement Age (FRA) is when you can claim 100% of your Social Security benefit. FRA depends on birth year:
Born 1943-1954: FRA is 66.
Born 1955-1959: FRA gradually increases by 2 months each year (1955=66+2mo, 1956=66+4mo, 1957=66+6mo, 1958=66+8mo, 1959=66+10mo).
Born 1960 or later: FRA is 67.
Claiming earlier than FRA reduces your monthly benefit permanently. Claiming later than FRA increases it permanently (up to age 70).
Early claiming reductions: claim at 62 (earliest) and you get 70-75% of your FRA benefit (depending on birth year). Claim at 65 = ~93%. Claim at FRA = 100%.
Delayed Retirement Credits: every year you delay past FRA, your benefit grows 8% — until age 70. Claim at 70 with FRA of 67 = 124% of FRA benefit. So claiming at 70 vs. 62 = roughly 76-80% MORE in monthly benefit. For life.