Longevity risk is the risk of outliving your money. More specifically, it’s the possibility that you’ll live longer than expected and exhaust your savings while you still need them. Over 90 percent of financial advisors say they’re at least somewhat concerned their clients will face this problem, and the math shows why: a 65-year-old man today has roughly a 1 in 5 chance of reaching 90, while a 65-year-old woman has nearly a 1 in 4 chance. Living a long life is good news, but it means your retirement savings may need to stretch 25 or 30 years instead of 15 or 20.
Why Living Longer Creates Financial Risk
Retirement planning is essentially a guess about how long you’ll need income without a paycheck. If you retire at 65 and die at 80, your savings need to cover 15 years. If you live to 95, they need to cover 30 years, twice as long, with the same starting balance. The problem is that nobody knows which scenario they’ll face.
Social Security Administration data from the 2025 Trustees Report puts this in concrete terms. Out of 100,000 men born alive, about 77,400 reach age 65, but roughly 16,500 make it to 90 and 5,055 make it to 95. For women the numbers are even higher: about 86,200 reach 65, with 24,000 surviving to 90 and nearly 11,000 reaching 95. These aren’t negligible odds. A 55-year-old has about a 7 percent chance of living to 95 or beyond, and when the consequence of being wrong is running out of money entirely, even a 7 percent probability is serious.
In a survey of 400 financial advisors, 17 percent believed that most of their clients would run out of money if they lived to age 95. Even at younger ages, the concern doesn’t disappear: 8 percent of advisors thought the majority of their clients would deplete their savings by 90.
The 4 Percent Rule and Its Limits
The most widely cited retirement withdrawal strategy is the 4 percent rule: withdraw an inflation-adjusted 4 percent of your total portfolio each year. In theory, this pace of spending should prevent you from running out of money over a typical retirement. In practice, it has significant blind spots.
The 4 percent rule doesn’t account for unexpected large expenses, like a major medical event or the need for long-term care. It also ignores the fact that mortality risk increases with age, meaning your spending needs can shift dramatically in your 80s and 90s. Perhaps most critically, it doesn’t adapt to market conditions. If the stock market drops sharply early in your retirement while you’re still pulling out that fixed percentage, you lock in real losses that your portfolio may never recover from.
How Market Timing Compounds the Problem
Longevity risk doesn’t exist in a vacuum. It interacts with something called sequence of returns risk, which is the danger that poor investment returns in the first few years of retirement will permanently damage your portfolio’s ability to sustain you.
Here’s why timing matters so much. If your portfolio drops 30 percent in year three of retirement and you’re also withdrawing money to live on, you’re selling investments at a loss. That money is gone permanently; it can’t participate in any future recovery. Without withdrawals, a market downturn is just a paper loss that reverses when prices rebound. With withdrawals, it’s a hole your portfolio never fully fills. Research by Wade Pfau estimates that the average return during the first 10 years of retirement explains 77 percent of the final retirement outcome. In other words, the market environment you retire into matters far more than what happens later.
The longer you live, the more time there is for a bad early sequence to compound. A retiree who lives to 78 might survive a rough first decade. A retiree who lives to 95 with the same poor start is in serious trouble, because the portfolio never had a chance to rebuild before decades of additional withdrawals drained it.
How Social Security Helps (and When to Use It)
Social Security is one of the few income sources that lasts your entire life, no matter how long you live. It also adjusts for inflation, which makes it a natural hedge against longevity risk. The key decision is when to start claiming it.
If you claim at 62, the earliest eligible age, your monthly benefit is 30 percent less than your full retirement age amount. If you delay past your full retirement age, your benefit grows by 8 percent per year up through age 69. That means someone who waits until 70 to claim could receive significantly more each month than someone who started at 62. For people worried about outliving their savings, delaying Social Security effectively buys a larger guaranteed income stream for life, though it requires having other funds to live on in the meantime.
Annuities as Longevity Insurance
Annuities are financial products that transfer longevity risk from you to an insurance company. You pay a lump sum, and in return the insurer guarantees monthly payments for as long as you live. There are several types, but the ones most directly targeted at longevity risk are longevity annuities, sometimes called deferred income annuities.
With a longevity annuity, you might pay $100,000 or more at retirement age and choose a future date, say age 85, when payments begin. Because you’re giving up access to that money for years and forgoing a death benefit (unless you purchase one separately), the monthly payouts tend to be higher than a traditional immediate annuity. The logic is straightforward: you use your own savings and investments to fund retirement through your early 80s, then the annuity kicks in to cover the later years when your portfolio is most at risk of running dry.
One specific version is a qualified longevity annuity contract, or QLAC, which you purchase with money from a 401(k) or IRA. QLACs meet certain IRS requirements and allow you to set aside a portion of your retirement account specifically for late-life income.
How Pension Funds Handle Longevity Risk
Longevity risk isn’t just a personal finance problem. It’s a major concern for pension funds and insurance companies that have promised lifetime payments to millions of people. If retirees collectively live longer than projected, these institutions face enormous unfunded liabilities.
Pension funds manage this risk through several mechanisms. In a buy-in, the pension fund pays an upfront premium to an insurer, and the insurer then makes periodic payments equal to what the fund owes its members. The pension fund keeps its assets and liabilities on the books, but the insurer absorbs the risk that people live longer than expected. A buy-out goes further, transferring both the assets and liabilities entirely to the insurer.
Longevity swaps are a more targeted tool. They transfer only the longevity risk itself, with the premium spread over the life of the contract based on the difference between actual and expected benefit payments. If retirees live longer than the projections, the swap counterparty (typically an investment bank or reinsurer) covers the gap. These swaps are often combined with investment strategies that match the expected timing of cash flows to pension payments, reducing the overall uncertainty the fund faces.
Practical Ways to Reduce Your Exposure
Managing longevity risk comes down to a few core strategies, most of which involve creating income you can’t outlive or reducing the amount you need to withdraw from savings.
- Delay Social Security to increase your guaranteed lifetime income. Each year you wait past your full retirement age adds 8 percent to your monthly benefit.
- Consider a longevity annuity to cover your later years. Even converting a portion of your portfolio into guaranteed income can protect against the worst-case scenario of living well past 90.
- Build flexibility into your withdrawal strategy rather than relying on a fixed percentage. Reducing spending during market downturns, even modestly, can dramatically improve your portfolio’s chances of lasting.
- Account for healthcare costs separately. Medical expenses tend to spike in later life, and treating them as a distinct budget category prevents them from blindsiding your general retirement plan.
Many financial advisors stress-test retirement plans by running simulations and considering the plan successful only if assets survive in at least 90 percent of market scenarios. That 10 percent failure threshold exists precisely because longevity risk means the consequences of running out aren’t just inconvenient. They’re catastrophic.