Longevity risk is the possibility of outliving your savings. Understanding what drives this risk helps retirees avoid running short on income, sacrificing their lifestyle, or leaving a spouse or family under-provided for.
This article covers what causes longevity risk, the warning signs you're underprepared, and concrete strategies to manage it, from withdrawal planning to portfolio construction.
TL;DR
- Longevity risk is the chance your retirement savings run out while you are still alive
- Rising life expectancy, inflation, healthcare costs, and market volatility drive the shortfall
- Underestimating lifespan, poor withdrawal order, and unplanned care costs make it worse
- Flexible withdrawals, diversified portfolios, delayed Social Security, and guaranteed income help prevent it
- Periodic reviews, stress tests, and coordinated tax and estate planning keep the plan on track
Common Causes of Longevity Risk
Longevity risk is the financial risk of outliving your assets. It differs from market risk or inflation risk because it's open-ended, tied to a lifespan nobody can predict in advance.
It usually comes from three forces working together: underestimated lifespans, faulty planning assumptions, and outside economic pressures.
Cause 1: Underestimating Life Expectancy
Many retirees plan around "average" life expectancy in their mid-80s. That average hides a meaningful chance of living well into your 90s.
Based on the Social Security Administration's 2023 actuarial data, a 65-year-old man has roughly a 24.1% chance of reaching 90, and a 65-year-old woman has about a 34.9% chance. For a couple, the odds that at least one spouse reaches 90 climb to roughly 50.6% (SSA actuarial life table).
Plan for a 30-year retirement, not a 20-year one.
Cause 2: Inflation Eroding Fixed Income
Fixed pensions, annuities, and bond income lose purchasing power every year inflation runs positive. Using the Federal Reserve's Rule of 72, a 3% average inflation rate roughly doubles your cost of living every 24 years (St. Louis Fed).
That means a retiree living 25-30 years past retirement could see everyday expenses double, while a fixed pension check stays exactly the same.
Cause 3: Rising and Unpredictable Healthcare Costs
Healthcare spending climbs with age, and long-term care is rarely covered by Medicare. Medicare's own guidance states plainly: "Medicare doesn't pay for long-term care" (Medicare.gov).
Fidelity estimates an average retiring couple needs approximately $345,000 after tax for healthcare costs alone, and that figure excludes long-term care entirely (Fidelity).
Cause 4: Poor Withdrawal Sequencing and Overspending Early
Retiring right before a market downturn and withdrawing at a fixed rate regardless of performance is one of the fastest ways to deplete a portfolio permanently. This is known as sequence-of-returns risk.
- Selling depreciated assets to fund withdrawals locks in losses
- Fewer shares remain to participate in the eventual recovery
- Two portfolios with identical average returns can produce wildly different outcomes depending on when the losses hit
When early withdrawals collide with a long lifespan, the shortfall compounds—leaving less margin precisely when longevity risk is highest.
What Happens If Longevity Risk Is Ignored
Ignoring longevity risk doesn't announce itself early. The consequences show up years later, when options are limited:
- Depleted savings in your late 80s or 90s, when you're least able to return to work
- Forced lifestyle downgrades that cut expenses once considered secure
- Growing dependency on family members for financial support
- No capacity to leave a legacy or fulfill charitable intentions
- Severe financial strain on a surviving spouse who outlives the primary breadwinner
Warning Signs You May Be Underprepared
Watch for these red flags in your own plan:
- Fixed end-date assumption: your plan assumes life ends at 85, not a range of outcomes
- No inflation adjustment: income sources are mostly fixed and won't grow with rising costs
- No healthcare reserve: there's no dedicated plan for medical or long-term care costs
How to Mitigate Longevity Risk
Managing longevity risk takes income strategy, investment discipline, and ongoing adjustments as circumstances change.
Strategy 1: Build a Sustainable, Flexible Withdrawal Plan
Structured "bucket" withdrawal approaches separate near-term cash needs from long-term growth assets. This reduces forced selling during market downturns.
Why it works: Near-term spending is insulated from volatility, so a bad market year doesn't force you to sell depreciated stocks. Morningstar's 2025 research found that poor returns in the first five years of retirement, without adjusting spending, dramatically increased the chance of running out of money.
Sentinel Asset Management builds structured withdrawal buckets that pair near-term liquidity with growth-oriented allocations for longer horizons. These work best when set up years before retirement begins, not after.
Strategy 2: Maintain a Globally Diversified, Risk-Managed Portfolio
Diversification rooted in modern portfolio theory balances the growth needed to outpace inflation against the stability needed for near-term spending.
Every Sentinel client portfolio is guided by an Investment Policy Statement, stress-tested against historical bear markets, recessions, and inflationary periods. Portfolios are monitored continuously for drift and rebalanced as retirement progresses.
When to implement: At every life stage, with periodic rebalancing throughout retirement.
Strategy 3: Optimize Social Security and Guaranteed Income Sources
Delaying Social Security increases your monthly, inflation-adjusted benefit for life. For anyone born in 1960 or later, benefits grow from 100% at full retirement age (67) to 124% at age 70 (SSA).
That's a permanent 24% boost simply by waiting three extra years, on income that can't be outlived and adjusts with inflation.
Best window: The years leading up to full retirement age through age 70, weighed against health, other income, and survivor needs.
Strategy 4: Plan Proactively for Healthcare and Long-Term Care Costs
Three common approaches cover these costs:
- An HSA offers tax-advantaged savings that roll over year to year
- Long-term care insurance covers nursing home care, in-home assistance, and assisted living
- Self-funded reserves prevent forced portfolio liquidation during a health crisis
Best addressed: In the years before and immediately after retirement, before a health event forces the decision.
Tips for Long-Term Monitoring and Control
Managing longevity risk doesn't end once a plan is built. Ongoing monitoring keeps withdrawal rates, taxes, and estate details aligned as markets and life change. Practical habits include:
- Review your plan at least annually to reassess withdrawal rates, spending, and market performance
- Reorder tax-efficient withdrawals across taxable, tax-deferred, and Roth accounts to cut lifetime tax liability
- Update estate documents, beneficiary designations, and account titling when goals or family circumstances change
- Coordinate investment, tax, and estate strategies with one advisory team instead of three separate conversations
Conclusion
Longevity risk has manageable causes—lifespan uncertainty, inflation, healthcare costs, and withdrawal missteps. A disciplined, diversified plan that you review regularly can preserve independence and quality of life across a retirement that may last 30 years or more.
Sentinel Asset Management has guided over 2,000 clients into retirement with an average planning horizon of 20+ years, using stress-tested portfolios and structured withdrawal strategies built for real-world conditions. Start by stress-testing your own longevity assumptions, then align savings, income sources, and withdrawals so the plan holds up for the full horizon you may actually live.
Frequently Asked Questions
What is the $1,000 a month rule for retirees?
This rule of thumb says every $1,000 in desired monthly income requires roughly $240,000 in savings, based on a 5% withdrawal assumption. It's a quick estimate, not a guaranteed formula, and should be adjusted for your actual withdrawal rate and circumstances.
What are the odds of living to 90 if you are 80?
SSA actuarial tables show a man who reaches 80 has roughly a 37.5% chance of living to 90, and a woman about a 47.2% chance. These are population averages; individual health and family history shift the odds.
What is the riskiest type of annuity?
Variable annuities generally carry the most risk because returns depend on underlying investments and aren't guaranteed, unlike fixed or income annuities. They also tend to carry complex fee structures and long surrender periods.
What is the average life expectancy after you retire?
Based on SSA's 2023 period life table, a 65-year-old man can expect about 18 more years on average, and a 65-year-old woman about 21 more years. These are averages, not planning ceilings, so many retirees live well beyond them.
What is a longevity risk?
Longevity risk is the possibility of outliving your retirement savings due to increasing lifespans. It's distinct from market or inflation risk because it's tied to an unknowable individual lifespan rather than a predictable economic cycle.
What are the habits associated with longevity?
NIH research links longer life to healthy eating, regular exercise, moderate alcohol intake, not smoking, and a healthy weight. Sleep quality and social connection also contribute.
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