Longevity risk is the probability of outliving your money. It is the mirror image of dying early: instead of leaving assets on the table, you exhaust them while still alive. Of all the risks in retirement finance, longevity risk is the most personal, the most uncertain, and the most consequential. A plan that fails at ninety doesn't allow course correction.
Most people systematically underestimate how long they will live. When asked to estimate their life expectancy, individuals consistently guess lower than the actuarial data predicts. The reasons are partly psychological, most people find it uncomfortable to project themselves to very advanced ages, and partly informational, the statistics are not widely known. The result is retirement plans built around lifespans that are too short, which means withdrawal rates that are too high, portfolios that are too conservative, and guaranteed income sources that have been optimized for the wrong horizon.
The actuarial reality is this: a 65-year-old man in the United States today has a median life expectancy to approximately age 84. A 65-year-old woman has a median expectancy to approximately age 87. For a married couple both aged 65, the probability that at least one spouse survives to age 90 is over 60%, and to age 95 is nearly 35%. These are not edge cases. They are the central tendencies of the distribution.
Planning to the median life expectancy means planning for a 50% chance of running out of money before you die. That is not a retirement plan. It is a coin flip.
Life expectancy has increased significantly over the past century and continues to improve. Advances in medical treatment, reductions in cardiovascular disease mortality, improved cancer survival rates, and better management of chronic conditions have extended both average and maximum lifespans beyond what prior generations experienced. A person who reaches 65 today is likely to live longer than actuarial tables from twenty years ago would have predicted.
The financial planning industry has been slow to update planning horizons to reflect this reality. Many financial plans still use age 85 or 90 as the terminal planning date. For a healthy 65-year-old couple, these horizons understate the realistic planning period by a decade or more for a meaningful fraction of the population.
The financial consequences of underestimating lifespan compound over time. A portfolio planned to last to 85 that runs dry at 82 leaves a retiree with three years of life and no assets beyond Social Security. For a healthy individual who reaches 82, the probability of surviving another ten or fifteen years is significant. The gap between the planned outcome and the actual outcome can be catastrophic.
Life expectancy and planning horizon are related but distinct concepts. Life expectancy at birth is the average age at death for a cohort born in a given year. Life expectancy conditional on reaching a given age, sometimes called remaining life expectancy, is more relevant for retirement planning. A person who has already survived to 65 has already beaten the odds of earlier death and should use a remaining life expectancy calculation.
The planning horizon should be set at a percentile of the survival distribution, not the median. Using the median life expectancy as the planning horizon means accepting a 50% probability of outliving the plan. A more prudent approach sets the planning horizon at the 75th or 90th percentile of the survival distribution, which for a 65-year-old couple means planning to 95 or beyond.
The longevity planning challenge is more acute for married couples because the relevant question is not how long each individual lives, but how long the household needs income. The probability that at least one of two people survives to a given age is higher than the probability for either individual alone.
For a married couple both aged 65, the probability that at least one spouse survives to 85 is approximately 82%. The probability that at least one survives to 90 is approximately 61%. The probability that at least one survives to 95 is approximately 35%. Planning to 90 protects the household in only 61% of cases. Planning to 95 is necessary to have confidence that the plan will work for most couples.
Each additional year of retirement has a compounding effect on the required portfolio size. A plan designed to last twenty years requires a meaningfully smaller portfolio than one designed to last thirty years, because the shorter plan has fewer years of inflation-adjusted withdrawals to fund, fewer years of compounding to provide, and less exposure to the tail scenarios where markets perform poorly for extended periods.
The difference between planning to 85 and planning to 95 on the same annual withdrawal amount, at the same assumed return, is significant. Running a retirement income model to 95 rather than 85 requires either a larger starting portfolio, a lower withdrawal rate, more guaranteed income sources, or some combination of all three. Discovering this gap at age 82, with the portfolio already in distribution, leaves little room to course correct.
Several financial products are specifically designed to address longevity risk. Deferred income annuities, sometimes called longevity annuities, allow a retiree to pay a premium in their sixties and begin receiving guaranteed income starting at a specified advanced age, such as 80 or 85. The deferred start date makes the premium relatively affordable because most purchasers don't survive to collect, and those who do receive income that pool survivors' benefits.
The QLACs, Qualified Longevity Annuity Contracts, are a specific type of deferred income annuity that can be purchased inside an IRA and deferred until age 85. Amounts placed in a QLAC are excluded from the RMD calculation until distributions begin, which provides an additional tax planning benefit alongside the longevity protection.
Social Security delayed to age 70 functions as longevity insurance through a different mechanism: it provides the highest possible monthly benefit for the rest of life, with inflation adjustments, funded collectively through the Social Security trust fund. For most retirees, maximizing Social Security is the most cost-effective longevity insurance available.
The Society of Actuaries has produced research specifically examining the gap between individuals' self-reported life expectancy estimates and actuarial projections. Their surveys consistently find that people underestimate their life expectancy by an average of five to seven years. This underestimation is more pronounced among people in good health, who are the very individuals most likely to survive to advanced ages.
The SOA's research argues that retirement planning should use percentile-based survival probabilities rather than mean expectations, setting the planning horizon at a level that provides meaningful protection against the tail of the survival distribution. For most retirees, this means planning to 95 or beyond.
Wade Pfau's research on safe withdrawal rates explicitly models the impact of longer planning horizons. His work shows that the safe withdrawal rate declines meaningfully as the planning horizon extends beyond thirty years. The historically safe rate for a thirty-year horizon is approximately 4%. For a forty-year horizon, representing a retiree at 65 planning to 105, the safe rate falls to approximately 3% to 3.5%. For a couple planning to 95, the forty-year planning horizon is appropriate for the surviving spouse and should inform the initial withdrawal rate decision.
Moshe Milevsky, a finance professor at York University who has written extensively on longevity risk and retirement income, argues that the pooling of longevity risk through annuitization is one of the most efficient ways to address the longevity problem. His research shows that the cost of self-insuring longevity risk from a portfolio, by maintaining a large enough portfolio to cover all possible lifespans, significantly exceeds the cost of purchasing guaranteed income that pools the longevity risk across many individuals.
Milevsky's work on the economics of annuities has influenced the academic literature on optimal retirement income strategies. His key finding is that rational retirees should annuitize a meaningful portion of their wealth, using guaranteed income to cover essential expenses, and rely on the portfolio for discretionary spending where the longevity risk is less critical.
McKinsey Global Institute research on global longevity trends has documented the increasing financial exposure of aging populations in developed countries. Their work highlights that the combination of increased longevity, declining pension coverage, and inadequate savings rates has created a structural retirement income gap that will affect a significant portion of retirees in the coming decades. The research argues for planning frameworks that explicitly address the full realistic range of lifespans, not just expected lifespans.
Planning to the average life expectancy means accepting a 50% probability of outliving the plan. For a financial decision with no second chances, a 50% failure rate is unacceptable. The planning horizon should be set at a conservative percentile of the survival distribution, typically the 75th to 90th percentile, which corresponds to ages 90 to 95 for most 65-year-olds. Using the mean expectancy is actuarially equivalent to flipping a coin on whether your retirement plan succeeds.
A retirement plan with a terminal date of 85 is frequently proposed and accepted because it produces an adequate-looking outcome. The problem is that for a 65-year-old today, there is roughly a 40% chance of surviving past 85. A plan that fails 40% of the time is not a plan. It is a plan with a built-in expiration date that doesn't match the actuarial reality.
An overly conservative portfolio, heavy in cash and short-term bonds, may feel safe but is actually more exposed to longevity risk because it doesn't generate the real returns needed to sustain inflation-adjusted withdrawals over a thirty-five to forty year horizon. A retiree who holds a very conservative portfolio to avoid short-term volatility may find that the portfolio is depleted by age 85 due to inflation erosion and insufficient growth, leaving the remaining years of life without adequate resources.
For married couples, the relevant longevity horizon is not each individual's life expectancy but the joint survival distribution. Even if both spouses have average life expectancy to 85, the household needs income for as long as either survives. The survivor, whoever that is, may live another fifteen or twenty years beyond the point when the other spouse dies. Planning to the longer of the two individual expectations, rather than to each individual's median, is the correct approach.
The tools most effective at addressing longevity risk, Social Security maximization, Roth conversion to reduce RMD burden in advanced age, appropriate equity exposure, and potentially guaranteed income products, are most powerful when implemented before retirement or in the early retirement years. A retiree who defers longevity planning until their mid-seventies has missed the window for most of these strategies.
For most healthy retirees, setting the planning horizon at 95 provides meaningful protection against longevity risk without requiring an unrealistically long planning period. This horizon ensures the plan covers the top third of the survival distribution for most 65-year-olds. The retirement calculator at plan.johnkoyle.com allows you to set any planning horizon and shows how the success rate changes as the horizon extends.
Delaying Social Security to 70 is the single most powerful longevity insurance tool available to most retirees. The larger benefit provides more guaranteed, inflation-adjusted income for a longer period, and the marginal value of each additional year of Social Security income increases at advanced ages when portfolio assets may be depleted.
A retiree planning to 95 has a thirty-year horizon even at age 65. Over thirty years, equity exposure is necessary to generate the real returns needed to sustain inflation-adjusted income. The allocation will be more conservative than during accumulation, but a completely bond-heavy or cash-heavy portfolio at retirement is incompatible with a thirty-year longevity horizon.
For retirees who are concerned about the scenario where they outlive their portfolio, deferred income annuities or QLACs can provide a backstop. A relatively modest premium in the mid-sixties can purchase significant guaranteed income beginning at 80 or 85, providing peace of mind that the very long scenarios are covered even if the portfolio is significantly depleted.
The answer should reflect actuarial reality for your health status. If the answer is 85 or younger, ask what the plan looks like extended to 95 and whether it still works.
Your advisor should be able to calculate this from actuarial tables. The answer often surprises people because we intuitively underestimate our own longevity.
This question tests the plan's longevity resilience directly. The answer should show a specific monthly income projection at age 95, not just a portfolio balance.
At very advanced ages, when portfolios may be depleted, Social Security becomes the primary income source. Maximizing it is the most important longevity planning action most people can take.
Planning to 95 is prudent. Testing the plan to 100 reveals whether there is catastrophic tail risk for the longest scenarios. For a 65-year-old today, the probability of reaching 100 is approximately 5 to 10%, which is not negligible.
The retirement planning calculator at plan.johnkoyle.com was built to model exactly the dynamics discussed in this paper. The retirement calculator at plan.johnkoyle.com allows you to set your planning horizon independently for each spouse, using your realistic life expectancy as the basis. The Monte Carlo simulation runs every scenario to the horizon you set, so planning to 95 means testing plan sustainability across 500 scenarios that extend to 95. You can see immediately how the success rate changes as you adjust the planning horizon from 85 to 90 to 95, and what that means for your required portfolio size, withdrawal rate, or Social Security strategy.
John Koyle, AIF®, is the Co-Founder of Red Cedar Wealth Advisors, headquartered in Pocatello, Idaho. He holds the Accredited Investment Fiduciary (AIF®) designation, awarded by the Center for Fiduciary Studies (Fi360), which signifies completed coursework, a rigorous examination, and ongoing continuing education in fiduciary responsibility and prudent investment practices.
John serves individuals and families in or approaching retirement throughout eastern Idaho, the Pacific Northwest, and across the country via Zoom. Clients work directly with John, not a junior team. Red Cedar Wealth Advisors operates under Osaic Wealth, Inc. (Member FINRA/SIPC) and Osaic Advisory Services, LLC for investment advisory services.
Every client relationship is built on five integrated disciplines. The proportions shift with the client and the moment. The integration is constant. Most of the actual value sits in how these disciplines connect, not in any single one of them.
Retirement planning is a discipline that barely existed a generation ago. For most of modern history, people worked until they physically couldn't and then they died, usually fairly close together. The idea that an individual should spend decades saving, then spend decades drawing down those savings, with a plan that accounts for inflation, taxation, sequence risk, healthcare, longevity, and estate transfer, that's maybe forty years old.
Which means almost nobody your age grew up watching their parents do it properly. There's no cultural muscle memory. The advice industry backfilled that gap with rules of thumb that work sometimes and fail catastrophically the rest of the time. The 4% rule. 'You can take Social Security at 62.' 'Target-date funds will handle it.' These are not bad starting points. They are terrible ending points. Real planning is specific, personal, and built on principles that hold up across the full range of outcomes, not just the average one.
The tax code is a set of instructions Congress wrote to shape behavior. Aligning your financial life with those instructions is not aggressive planning. It is the planning. Roth conversion sequencing, capital gains compression on concentrated positions, charitable remainder trusts, Social Security timing, beneficiary coordination. None of these are obscure. They're all legitimate, all written into the code intentionally, and all under-used. Most CPAs handle compliance. The strategy work is a different discipline entirely.
Seventy percent of family wealth doesn't survive two generations. The reason isn't bad markets. The cause is failure to communicate, outdated documents, and no plan for preparing heirs. Beneficiary designations regularly override well-crafted wills. Trust structures created a decade ago no longer match current law or current family. The portfolio that built the wealth isn't the structure that transfers it. The work here is coordinating with your attorney to align documents, beneficiaries, gifting strategies, and trust funding with what you actually want to happen.
Every week, before any portfolio decision, John runs through four layers of market health: economic conditions, market internals, valuations, and sentiment. Each layer gets scored and those scores combine into a composite that maps directly to a portfolio posture, from aggressive on the positive end to defensive on the negative. The work is in the scoring. Once the scoring is done, the positioning follows. That removes one of the most dangerous things in investing: making it up as you go.
The protection gap quietly kills more plans than markets do. A significant net worth paired with inadequate liability coverage is a lawsuit away from a serious problem. Long-term care is more acute: a multi-year care event for one spouse can consume what was meant for the survivor. Most advisors relegate risk to a footnote because insurance conversations are uncomfortable. The math doesn't care. Coverage adequacy, umbrella sizing, long-term care planning, and life insurance structure sit alongside the portfolio in any complete plan.
These are the principles behind every plan John builds.
To begin a conversation, visit johnkoyle.com, use the retirement planning calculator at plan.johnkoyle.com, or reach John directly at john@redcedarwealth.com or (208) 915-8400. Initial consultations are complimentary and carry no obligation.