Will Your Retirement Money Last 30 Years?

The principle: plan for a long retirement, not an average one

Retirement is less like a sprint to a finish line and more like a marathon with an unknown distance. You do not know how long it will last, so the safest plan is one that still works if it lasts a long time.

Average life expectancy is easy to misread. An average is a midpoint: roughly half of people live longer than it. J.P. Morgan's 2026 Guide to Retirement, which draws on Social Security Administration life tables and the actuaries' Longevity Illustrator, puts it plainly: average life expectancy is "a mid-point not an end-point," and you may need to plan for "perhaps 35 years in retirement," particularly if you are a non-smoker in good health. For a married couple, the planning horizon is set by whichever of you lives longer.

That does not mean everyone should assume they will live to 100. It means your plan should be tested against a long horizon, so that a long life is something you can enjoy rather than something you have to worry about. You can get a rough personal starting point from the Social Security Administration's life expectancy calculator, keeping in mind that it reports an average, not a ceiling.

Why inflation is the quiet risk

Market drops are loud. Inflation is quiet. It rarely makes headlines in a single year, yet over a long retirement it can do more damage than any one downturn, because it never reverses.

The arithmetic is simple. If prices rise 3% a year, something that costs $60,000 today costs about $108,000 in 20 years and about $146,000 in 30 years. Put another way, at 3% inflation a dollar buys only about 48 cents' worth of today's goods after 25 years. Even at a gentler 2.5%, $60,000 of spending grows to about $98,000 in 20 years.

These rates are assumptions for illustration, not forecasts. Actual inflation varies year to year, and your personal inflation rate depends on what you buy; healthcare, for example, can rise at a different pace from the overall index.

This is why a portfolio held entirely in cash or short-term bonds is not automatically "safe." It protects you from seeing a big drop on a statement, but it can expose you to a slower risk: that your money keeps its number while losing its purchasing power. J.P. Morgan's guide makes the same point: investing a portion of a portfolio for growth is important to maintain purchasing power over time.

A worked example: the same savings, three growth assumptions

Assumptions (hypothetical): $1,000,000 portfolio at retirement; first-year withdrawal of $45,000, increased by 3% every year to keep pace with inflation; a constant annual return each year (3%, 5% or 6% before inflation); no taxes, fees, Social Security or other income are modeled. Real returns are not constant, and the order of good and bad years matters a great deal, so treat this as a picture of the concept, not a projection.

Applied to Linda, who retires at 64, this simplified model runs out of money around age 86 if her savings only keep pace with inflation, around 92 at a 5% return, and close to 98 at 6%. The difference between those outcomes is not luck in any single year. It is the long-run growth rate of the portfolio, which is shaped by her allocation.

The example also shows the catch. Growth assets such as stocks are what make the higher numbers possible, and they are also what make a statement drop in a bad year. There is no allocation that avoids both risks entirely; the decision is about balancing them.

What you can do

Most of what matters here sits in the layer you directly control: how you invest, how much you spend and how you plan withdrawals.

• Choose a planning horizon on purpose. Many planners test plans to age 90 or 95, or longer if you are healthy and have long-lived parents. Pick a number, write it down and revisit it every few years.
• Separate near-term and long-term money. Money you will spend in the next few years can sit in steadier assets. Money you will not touch for a decade or more can be invested for growth. This makes market drops easier to live through because next year's grocery bill is not riding on this year's market.
• Match your allocation to your plan, not to the headlines. There is no universal "right" percentage in stocks at any age. Your number depends on your spending needs, other income such as Social Security or a pension, how much flexibility you have and how you behave when markets fall.
• Build inflation into your spending plan. Estimate retirement spending in today's dollars, then assume it rises over time. Revisit the estimate when your life changes.
• Consider inflation-adjusted income. Social Security benefits receive cost-of-living adjustments, which is one reason the timing of your claim matters for longevity planning. See Principle 04.
• Stress-test the plan. Tools such as the WealthLanding Retirement Feasibility Engine let you see how a plan holds up under different assumptions.

A short longevity checklist

• I have chosen a planning age (for example 90 or 95) and know why.
• I know roughly how much I expect to spend each year in retirement, in today's dollars.
• I have assumed that spending will rise with inflation over time.
• I know which money is for the next few years and which is for the long term.
• My investment mix reflects my plan and my comfort with ups and downs, not just this year's news.
• I review the plan at least once a year and after any major life change.

Put this principle to work

These WealthLanding tools and guides from the Retirement Lab help you apply this principle to your own numbers.

• Retirement Feasibility EngineTest whether your savings and spending hold up if retirement lasts into your 90s.
• Retirement Scenario LabCompare retirement ages and spending paths year by year.
• Retirement GatewayStart a connected plan that carries your timeline through the other tools.

Common misconceptions

"Cash is the safe choice."

Cash is safe from short-term price swings. It is not safe from inflation over 20 or 30 years. Holding some cash is sensible; holding everything in cash for decades is a different kind of risk.

"I only need to plan to my life expectancy."

Life expectancy is an average. Planning to the average means roughly even odds of outliving the plan. For couples, the longer-lived partner sets the horizon.

"Once I retire I should stop investing for growth."

Retirement can last decades, and part of your money may not be spent for 20 years or more. Many people keep some growth investments throughout retirement for exactly that reason; how much is a personal decision.

"A bad first year means the plan has failed."

A bad early year matters, which is why reserves for near-term spending help. But one year does not decide a 30-year plan, and adjusting spending modestly after poor years is one of the most effective levers available.

When your circumstances change the answer

• Guaranteed income covers most of your needs. If Social Security plus a pension covers most of your spending, your portfolio carries less of the load and you may need less growth, or you may choose to keep growth for heirs. Both are reasonable.
• Serious health conditions. A shorter expected horizon can justify different choices, though planning for a surviving spouse still matters.
• Very large or very small savings relative to spending. The trade-offs above matter most in the middle. At the extremes, other questions, such as estate planning or reducing spending, may dominate.
• Your own reaction to losses. An allocation you abandon in a downturn is worse than a slightly more conservative one you can stick with.

Questions readers ask

How long should I plan for my retirement to last?

There is no single right answer. Many planners test plans to age 90 or 95, or longer for healthy non-smokers. J.P. Morgan's 2026 Guide to Retirement suggests you may need to plan for perhaps 35 years in retirement. The key is choosing a horizon that would still work if you live longer than average.

Is it ever reasonable to hold mostly cash in retirement?

For short-term needs, yes. Holding a few years of planned withdrawals in cash or similar assets can make market drops easier to manage. Holding all of a long-term portfolio in cash for decades exposes it to inflation risk, so most plans pair cash reserves with longer-term investments.

What percentage of my portfolio should be in stocks?

There is no universal percentage. The right mix depends on your spending, other income, time horizon, flexibility and how you react to losses. A fee-only financial planner or a planning tool can help you test different mixes against your own plan.