Your Social Security full retirement age by birth year is 66 if you were born between 1943 and 1954, somewhere between 66 and 2 months and 66 and 10 months if you were born between 1955 and 1959, and 67 if you were born in 1960 or later. That’s the age at which you collect 100% of the benefit you earned, with no reduction for claiming early and no bonus for waiting.1Office of the Law Revision Counsel. 42 USC 416 – Additional Definitions
Full Retirement Age by Birth Year
Federal law ties full retirement age to the year you were born, not the year you decide to file. The schedule phases in the shift from the original age of 65 gradually, so no single birth cohort absorbed the whole change at once.
- Born 1943 through 1954: 66
- Born 1955: 66 and 2 months
- Born 1956: 66 and 4 months
- Born 1957: 66 and 6 months
- Born 1958: 66 and 8 months
- Born 1959: 66 and 10 months
- Born 1960 or later: 67
Anyone born in 1960 or after now falls at the top of the schedule, with a full retirement age of 67. Congress built the two-year climb from 65 into the law decades ago as a response to longer life expectancies.1Office of the Law Revision Counsel. 42 USC 416 – Additional Definitions
The January 1 Birthday Rule
Social Security treats a birthday that falls on the first day of a month as if it fell in the previous month. Someone born on January 1, 1960, for example, is grouped with 1959 births, which puts their full retirement age at 66 and 10 months rather than 67. If your birthday sits right on that boundary, check the row above the one you’d expect.2Social Security Administration. More Info: When To Start Benefits
What Happens If You Claim Before Full Retirement Age
You can start collecting retirement benefits as early as 62, but the reduction is permanent. It doesn’t reverse when you eventually reach full retirement age; the smaller amount is what you receive for life, adjusted only for annual cost-of-living increases.3Office of the Law Revision Counsel. 42 USC 402 – Old-Age and Survivors Insurance Benefit Payments
The reduction has two layers. For the first 36 months you claim before full retirement age, your benefit drops by 5/9 of 1% per month. For any additional months beyond 36, the reduction is 5/12 of 1% per month. If your full retirement age is 67 and you file at 62, that’s 60 months early, producing a 30% cut. A $2,000 full-age benefit becomes $1,400.4Social Security Administration. Benefit Reduction for Early Retirement
What Happens If You Wait Past Full Retirement Age
Every month you delay past full retirement age, your benefit grows through delayed retirement credits. For anyone born in 1943 or later, the rate is 2/3 of 1% per month, or 8% per year.5Social Security Administration. Delayed Retirement Credits
Credits stop accumulating at age 70. Waiting any longer earns you nothing. Someone with a full retirement age of 67 who delays until 70 picks up a 24% increase, turning a $2,000 full-age benefit into $2,480 a month. The largest possible Social Security payment for someone retiring at 70 in 2026 is $5,181 per month.6Social Security Administration. What Is the Maximum Social Security Retirement Benefit Payable?
If you’ve already passed your full retirement age when you finally apply, you can request up to six months of retroactive payments. Social Security won’t pay retroactive benefits for any month before you reached full retirement age, so this option only helps people who waited past that point. Asking for the back payments effectively resets your claiming date earlier, which erases the delayed credits you would have earned for those months.5Social Security Administration. Delayed Retirement Credits
Why the Number Matters Beyond the Benefit Amount
Full retirement age isn’t only the dividing line between reduced and unreduced payments. It also controls when the earnings test stops applying, when you can voluntarily suspend benefits to earn delayed credits, and when withheld benefits get recalculated. Most age-based rules in Social Security use full retirement age as their reference point.
The earnings test is the one that surprises people most. If you collect Social Security before full retirement age and keep working, part of your benefit is withheld when your income crosses a threshold. In 2026, Social Security withholds $1 for every $2 you earn above $24,480 if you’re under full retirement age all year. In the year you reach full retirement age, the formula loosens to $1 withheld for every $3 above $65,160, counting only earnings before the month you hit that age.7Social Security Administration. Receiving Benefits While Working
Once you reach full retirement age, the earnings test disappears entirely. You can earn any amount without losing a dollar of benefits.8Social Security Administration. 20 CFR 404.430 – Monthly and Annual Exempt Amounts Defined
The money withheld through the earnings test isn’t lost. When you reach full retirement age, Social Security recalculates your monthly benefit to credit you for the months where payments were reduced or withheld, and the new, higher amount applies going forward. The earnings test feels like a penalty, but it functions closer to a forced delay that gets partially paid back later.9Social Security Administration. Retirement Ready Fact Sheet for Workers Ages 61-69
Do You Even Qualify Yet?
Before any of the age math matters, you need to be insured. That means at least 40 work credits, or roughly 10 years of covered employment. In 2026, you earn one credit for every $1,890 in covered wages, up to four credits per year. Without those 40 credits on your own record, your options run through a spouse’s or ex-spouse’s earnings history rather than your own.
Medicare Doesn’t Follow Your Full Retirement Age
Medicare eligibility starts at 65, regardless of when your full Social Security retirement age falls. If your full retirement age is 67, Medicare still begins two years earlier, and missing the enrollment window can carry permanent late-enrollment penalties on your Part B premium. Your initial enrollment period runs seven months: the three months before the month you turn 65, that month itself, and the three months after.10Medicare. When Does Medicare Coverage Start?
If you haven’t claimed Social Security by 65, Medicare enrollment won’t happen automatically. You have to sign up yourself. People already receiving Social Security benefits at 65 are typically enrolled without having to do anything.11Social Security Administration. Medicare