Millions of American workers are still planning their retirements around a number they memorized years ago—and that number may already be wrong.
The full retirement age for Social Security, the point at which you can collect your entire monthly benefit, has been climbing for decades.
For anyone born in 1960 or later, it now sits at 67, not the 65 that many people still assume.
That gap matters more than most households realize, because claiming early permanently shrinks your check.
Claim at your full retirement age and you get 100% of your calculated benefit.
Claim at 62, the earliest allowed, and the reduction is steep—roughly 30% if your full retirement age is 67.
Wait until 70, and you earn delayed retirement credits of about 8% per year, pushing your payment well above the baseline for the rest of your life.
For a worker expecting $2,000 a month at 67, claiming at 62 could mean closer to $1,400.
Over a 20-year retirement, that spread runs into six figures.
So why does this keep tripping people up?
Because "retirement age" gets used to mean three different things.
There's the age you can first claim, the age you get your full benefit, and the age you must stop working to avoid the earnings test if you claim early.
Confusing them is how people retire with less income than they planned.
If you have health problems, a physically demanding job, or no other savings, claiming early can be the right call—a smaller check now beats a bigger one you may not live to collect.
If you're in good health, still working, or married to a higher earner, waiting often pays off.
When one spouse dies, the survivor keeps the larger of the two benefits.
A higher earner who delays claiming effectively buys longevity insurance for the household, not just for themselves.
Divorced Americans who were married at least 10 years may also claim on an ex-spouse's record under certain conditions.
There's also a tax wrinkle that catches retirees off guard.
Up to 85% of Social Security benefits can be taxable depending on your total income, and those thresholds haven't been adjusted for inflation in decades.
A modest pension or a part-time job can quietly push you into taxable territory.
Meanwhile, the program's trust fund faces a projected shortfall in the 2030s.
That doesn't mean benefits vanish, but it does mean future retirees could see across-the-board cuts if Congress doesn't act.
Anyone under 50 should treat the current schedule as a planning baseline, not a promise carved in stone.
The practical takeaway: check your actual full retirement age on the Social Security Administration's website, look at your earnings record for errors, and run the numbers at 62, 67, and 70 before deciding.
A free account takes minutes to set up. **Our take:** The biggest retirement mistake isn't claiming at the "wrong" age—it's never running the numbers at all.
A few minutes on the SSA website can be worth tens of thousands of dollars over a retirement.
Final Thoughts
Treat your claiming date as one of the largest financial decisions you'll ever make, because it is.