What Is the Earliest I Can Retire? How to Find Your Number

Sixty-two. For most Americans, that's the first number that comes to mind when they ask, "What is the earliest I can retire?" It's the earliest age you can claim Social Security. But claiming then comes at a price. If your full retirement age is 67, taking benefits at 62 cuts them by 30%, and the cut is permanent (SmartAsset; Schwab).

Some doors also open before 62. One opens at 55 and another at 59½.

So the question has two answers. The legal answer is a short list of fixed ages. The personal answer is the earliest age your money is likely to last. This guide covers both and spends more time on the second, because that's the one that decides whether you can actually stop working.

What is the earliest I can retire? The short answer

Legally, you can retire at any age. Nobody makes you keep working. What changes with age is when you can get at your money without a penalty, and how big your benefits are. In the US, these are the ages to know:

Sources: Clark.com, WTOP, "10 Important Ages for Retirement Planning," June 2026, GOBankingRates.

That table is a list of rules. It isn't your answer yet.

The milestones, one at a time

55: The Rule of 55

Say you leave your job in or after the calendar year you turn 55. You can then take money out of that employer's 401(k) or 403(b) without the usual 10% early-withdrawal penalty. Two catches. The rule doesn't cover IRAs. And if you roll that 401(k) into an IRA, you lose the exception (Experian, "What Is the Rule of 55?").

Penalty-free doesn't mean tax-free. You still owe ordinary income tax on those withdrawals.

59½: Retirement accounts open up

Most withdrawals from retirement accounts before 59½ carry a 10% penalty on top of ordinary income tax (NerdWallet). After 59½, the penalty no longer applies.

62: Social Security, at a discount

Claiming at 62 is allowed, but you take a smaller check for the rest of your life. Here's the gap at the top of the scale: in 2026, the maximum monthly benefit is $2,969 at 62 and $5,181 at 70 (Maximize My Social Security, 2026). Most people get less than the maximum, but the shape is the same for everyone. The longer you wait, the bigger the check.

There's also the earnings test. If you claim before full retirement age and keep working, Social Security holds back $1 for every $2 you earn above $24,480 in 2026. In the year you reach full retirement age, it holds back $1 for every $3 above $65,160. From the month you reach full retirement age, there's no limit (CNBC, April 2026).

65: Medicare

This is the age that often matters most for people who want to retire early. If you stop working before 65, you need to cover your own health insurance until then.

Why the legal age isn't your retirement age

Every page that ranks for this question gives you some version of that table. Few go on to ask the obvious next question: can your money cover the years you want to stop working?

Retiring at 55 doesn't just mean leaving work early. It also means:

• More years of withdrawals. Your savings have to last longer.
• Gap years. You may live on savings alone before Social Security, before Medicare, or both.
• More exposure to bad timing. A market drop just before or soon after you retire does the most damage, because you're selling investments while prices are down. This is called sequence-of-returns risk, and early retirees carry more of it because they have a longer stretch of withdrawals ahead.

Then there's longevity. According to the Social Security Administration, about one in three 65-year-olds may live to 90 or beyond (SSA, Retirement Information for Medicare Beneficiaries, 2026). A plan that runs out at 85 is betting against a third of retirees.

Then health care. Fidelity estimates that a 65-year-old retiring in 2025 will spend $172,500 on Medicare premiums, deductibles and prescriptions over retirement, and that figure doesn't include long-term care (Fidelity Investments, 2025 Retiree Health Care Cost Estimate, July 2025). Retire before 65 and your health care bill starts earlier.

Bridging the gap years

If you want to stop before 62 or 65, you need a plan for the years in between. Many early retirees draw on their money roughly in this order:

1. Taxable savings and brokerage accounts first. Age rules don't apply to them.
2. Rule of 55 withdrawals from your most recent employer's 401(k), if you qualify.
3. Other ways into retirement money before 59½. IRS-approved substantially equal periodic payments (often called 72(t) or SEPP) and Roth conversion ladders both exist. Both have strict rules, so check the details before you rely on either.
4. IRAs and other retirement accounts at 59½, with the penalty gone.
5. Social Security, at whatever age you decide to claim. Each year you wait means a larger check.
6. Medicare at 65, which replaces whatever coverage you used to bridge the gap.

The order depends on your accounts, your taxes and your goals. The point is that each gap year has to be paid for out of something, and those years often draw down savings fastest.

The real question: what's the earliest age your plan survives?

Here's a more useful way to ask "When can I retire?":

At which age does my plan have a high enough chance of lasting?

That's a question about odds. A single projection can't answer it.

Many retirement calculators assume an average return every year, say 6%, and draw a straight line. Markets don't move in straight lines. Two people with the same average return can end up in very different places depending on when the good and bad years land.

A Monte Carlo simulation handles this by running your plan through many possible futures. Some have strong markets, some have weak ones, and some have a crash in year two. Then it counts how many of those futures still have money left at the end. That count is your success rate.

This is also how Morningstar frames its safe withdrawal research. Its 2025 work puts the safe starting withdrawal rate at 3.9%, defined as the rate at which money is still there in 90% of simulated outcomes over a 30-year retirement (Morningstar, The State of Retirement Income 2025, December 2025). Note that the 3.9% comes from a 30-year horizon. A 55-year-old planning to 95 needs money for 40 years.

What success rate should you aim for?

No single number is right for everyone, but there are common benchmarks:

• 80–90% is the range most advisers have long treated as about right (CNN Money).
• One calculator treats above 85% as strong and below 70% as a sign the plan needs changes (Ryan O'Connell Finance).

Your target also depends on how flexible you are. If you can cut spending in a bad year, take on part-time work, or put off a big purchase, a somewhat lower success rate may be fine. If your budget is fixed, aim higher.

A success rate is a probability, not a promise. 90% means the plan lasted in 90% of the simulated futures. It doesn't guarantee yours will.

How to find your number

Here's a practical way to work it out:

1. Know your monthly spending. Not a guess. Look at real numbers. In EBRI's 2025 Retirement Confidence Survey, only 52% of workers had estimated the monthly income they'll need in retirement, so 48% are guessing (EBRI/Greenwald, Retirement Confidence Survey 2025, Fact Sheet 3).
2. Add up what you've saved, and note which accounts it's in. That determines what you can reach before 59½.
3. Run your plan to at least 95, not 85.
4. Test the plan at different retirement ages. Try 55, 58, 60, 62 and so on.
5. Pick your target success rate, for example 85% or 90%.
6. The earliest age that clears your target is your number. Then stress-test it with a bad market early on, higher health care costs, or claiming Social Security at 62 instead of 67, and see how far the success rate drops.

Monte Climb is built for this kind of test. You enter three numbers: your age, your retirement savings, and what you spend each month. The Monte Climb retirement calculator runs them through 1,000 simulated futures and shows how many stay funded. Plans run to age 95 by default, and you can extend them. Health care costs are charged year by year, including Medicare premiums and income-based surcharges, rather than as one flat guess. Everything runs in your browser, and nothing is saved until you choose to save it.

If you'd rather talk it through, you can ask William, the AI planner, questions like "Am I on track?" or "Can I retire at 62?" He shows his work. It's planning software, not financial advice.

A note for readers outside the US

The ages are different elsewhere. In the UK, for example, you can usually access a private pension from 55, rising to 57 in 2028, and the state pension age is 66, rising to 67 (Which?). Check your own country's rules, then apply the same test. The legal age tells you when the doors open. The probability tells you whether walking through them makes sense.

The bottom line

The earliest you can retire, legally, is whenever you choose. The earliest you can retire comfortably is the first age at which your savings last across most plausible futures, including bad markets, a long life and rising health care costs.

Want to see where you stand? Enter your three numbers and show my answer.

Frequently asked questions

What is the earliest age I can retire in the US?

Legally, you can retire at any age. The key milestones are 55 (Rule of 55 for your most recent employer's 401(k) or 403(b)), 59½ (penalty-free retirement account withdrawals), 62 (earliest Social Security), 65 (Medicare) and 67 (full retirement age for anyone born in 1960 or later).

How much do I lose by claiming Social Security at 62?

If your full retirement age is 67, claiming at 62 permanently cuts your benefit by 30%. For example, the 2026 maximum monthly benefit is $2,969 at 62, compared with $5,181 if you wait until 70.

Can I withdraw from my 401(k) at 55 without a penalty?

Yes, under the Rule of 55, if you leave your job in or after the year you turn 55. It only applies to that employer's 401(k) or 403(b), not to IRAs, and rolling the money into an IRA loses the exception. You still owe income tax on withdrawals.

What success rate should my retirement plan have?

Most advisers have long considered an 80–90% probability of success about right. If your spending is flexible, you may accept a somewhat lower rate. If your budget is fixed, aim higher. A success rate is a probability, not a guarantee.

How do I figure out the earliest age I can personally retire?

Test your savings and monthly spending at several retirement ages using a Monte Carlo simulation that runs to at least age 95. The earliest age where your success rate clears your target, such as 85% or 90%, is a reasonable starting point. Then stress-test it.