A financial plan can tell you whether your money will last. A health plan can tell you how long you might remain healthy. But neither tells you whether you’ll have both the health and the money to enjoy a long life.

Longevity financial planning is the process of planning your finances around the possibility of a long, healthy life. It brings your Healthspan and Wealthspan together, helping you make financial decisions that support the life you want to live — whether you live to 80, 90 or 100.

Most financial planning starts with one question: How much money will I need?

Most longevity planning starts with another: How long will I live, and how healthy will I be?

The problem is that these are not separate questions.

If you live to 95 but your health deteriorates at 72, you need a different financial plan from someone who remains active and independent into their 80s.

And if you remain healthy and capable into your 90s, you may need your money to support a much longer and more active life than a traditional retirement plan assumes.

This is the idea behind longevity financial planning: planning your health and your finances together, so that you have both the capacity and the resources to enjoy a long life.

What is longevity financial planning?

Longevity financial planning is the process of planning your healthspan and finances together so you can maximise the years in which you have both the health and financial resources to live the life you want.

It combines two traditionally separate disciplines:

Healthspan planning — supporting the years in which you remain healthy, capable and independent.

Financial planning — making sure your money can support the life you want for as long as you live.

The goal isn't simply to maximise lifespan or accumulate more wealth — it is to maximise the years in which you have the health, freedom and financial security to live life on your terms.

At 100 Great Years, we think about these as two connected engines: Healthspan and Wealthspan.

Key takeaways

• Longevity financial planning combines health and financial planning.
• Healthspan is about maintaining the capacity to live well as you age.
• Wealthspan is about how long your financial resources can sustain the life you want.
• Traditional retirement planning can benefit from considering a wider range of longevity and health scenarios.
• The goal isn't to predict exactly how long you will live. It's to make better decisions under uncertainty.
• The most valuable decision may be the one that improves the weaker of your two trajectories: health or wealth.

Why traditional retirement planning isn't enough

A conventional retirement plan might ask:

• When will you retire?
• How much have you saved?
• What will your investment returns be?
• How much will you spend each year?
• Will your money last until a particular age?

Those are important questions. But they don't tell you whether you'll be healthy enough to enjoy the years your money is funding.

Imagine two people who are both financially able to retire at 60.

One has excellent cardiovascular fitness, good strength, healthy metabolic markers and strong social connections. The other has poor fitness, declining strength and several health risk factors. They have the same financial plan, but they don't have the same retirement.

Now reverse the situation.

Imagine someone who maintains excellent health into their 90s but runs out of money at 78. Their health has become an asset they cannot fully use.

A long life requires both health and financial resilience.

Healthspan and Wealthspan: two engines, one life

Think of your future as being powered by two engines.

Engine 1: Healthspan

Healthspan is the period of life in which you remain capable, mobile, mentally engaged and able to live independently — not just alive.

Healthy ageing isn't simply the absence of disease. The World Health Organization frames healthy ageing around maintaining functional ability — the capabilities that enable people to live well as they age.

Healthspan can be influenced by factors including:

• cardiovascular fitness
• strength
• nutrition
• sleep
• healthy body composition
• alcohol and tobacco use
• preventive healthcare
• relationships and social connection

The goal isn't perfect health — it's to give yourself the best possible chance of remaining capable for longer.

For more on the health side, read How to Live to 100: The Science of a Longer, Healthier Life.

Engine 2: Wealthspan

Wealthspan asks a different question from net worth.

How long can your financial resources sustain the spending required for the life you want?

A $1 million portfolio means very different things to someone spending $30,000 a year than to someone spending $80,000. That's why the important financial question isn't always: "How much money do I have?" It can be: "How many years can my money support the life I want?"

Wealthspan changes when you change:

• income
• spending
• savings
• investments
• retirement timing
• financial assumptions

100 Great Years uses Wealthspan projections to show how long money can last on a current trajectory and how changing these financial variables — or any number of life events — can affect the result.

The longevity gap

Once you look at health and wealth together, another question becomes possible: Which one is likely to become the constraint first?

Suppose your financial plan can support you to age 100, but your current health trajectory suggests a much shorter period of good physical function. Your financial plan may be strong, but your healthspan is the constraint.

Or suppose you're likely to remain healthy and active for decades, but your current savings and spending trajectory leaves you financially exposed in your 80s. Your health may be the stronger engine and your finances are the constraint.

This is what we call your longevity gap.

It isn't a precise prediction of your future; instead, it's a framework for identifying where today's decisions could have the greatest effect on the life you eventually experience.

What can you change?

The encouraging part is that neither trajectory is fixed.

Health can change through relatively ordinary behaviours that compound over decades. Physical activity is a good example. WHO recommends at least 150–300 minutes of moderate aerobic activity per week, or 75–150 minutes of vigorous activity, together with muscle-strengthening activity on at least two days per week for adults.

Other health factors worth paying attention to include:

• strength
• sleep
• nutrition
• smoking
• alcohol
• healthy weight
• preventive healthcare
• social connection

The National Institute on Aging identifies many of these as practical areas in which people can support healthy ageing.

Finances can change through equally ordinary decisions:

• savings rate
• spending
• investment costs
• asset allocation
• retirement timing
• income
• debt
• major purchases

The interesting part is that the two sides can interact.

Working longer may increase financial security, but it also changes the amount of time available for health, family and other priorities.

Spending more on travel, exercise, better food or other lifestyle priorities may reduce short-term savings but increase the quality of the years you're funding.

Retiring earlier may give you more freedom while you're healthy, but requires a stronger financial plan.

There is no universal answer. The right answer depends on your numbers and your priorities.

What should a longevity financial plan look like?

A useful longevity plan should allow you to explore questions such as:

What happens if I retire at 55 instead of 65?

What happens if I increase my savings rate by 5%?

Will my money last if I live to 100?

Could I spend more now without compromising my later years?

What happens if markets fall significantly?

How valuable would an extra decade of good health be to me?

Should I prioritise improving my fitness, increasing my savings, or both?

These aren't questions a health app or a traditional financial calculator can answer on its own — they require the two models to be considered together.

Longevity planning isn't about predicting the future

This distinction matters.

No one knows exactly how long they will live. A survival curve isn't a personal prophecy. A financial projection isn't a guarantee. And a health score doesn't tell you exactly what will happen to your body over the next 40 years.

The value of longevity planning is different. It helps you make decisions when the future is uncertain.

Instead of asking:

"Exactly what will happen to me?"

you ask:

"What happens to my plan under several plausible futures?"

That is a much more useful question.

From planning to action

A plan is only useful if it changes what you do. That means identifying the areas where a relatively small change could have a meaningful long-term effect.

Perhaps that's improving your cardiovascular fitness.

Perhaps it's building strength.

Perhaps it's increasing your savings rate.

Perhaps it's reducing spending.

Perhaps it's working another year.

Perhaps it's making time for relationships.

Perhaps it's simply starting to track something you've previously ignored.

The objective isn't to optimise everything.

It's to identify the highest-value decisions.

This is what 100 Great Years is built to do

100 Great Years brings health and wealth into one longevity planning system.

The platform combines Healthspan and Wealthspan modelling with personalised practices, tracking and an AI Coach. Its Healthspan model applies published research to user inputs and explicitly presents the resulting survival curve as evidence applied to decisions, not a prediction.

The aim is to help you see the two trajectories together.

How healthy might I be?

How long might my money support the life I want?

Where is my biggest opportunity?

What happens if I change something?

That's the practical promise of longevity financial planning.

The question isn't "How much do I need to retire?"

It is:

"How do I build a life that I can afford for as long as I am capable of enjoying it?"

That requires thinking about health and wealth as two parts of the same plan. Not because either can be predicted perfectly, but because both can be influenced.

Build your Healthspan.

Build your Wealthspan.

Then make the most of the years where they overlap.

That's the philosophy behind 100 Great Years.

For the financial side of the equation, read How Much Money Do You Need to Live to 100?.

For the health side, read How to Live to 100: The Science of a Longer, Healthier Life.

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This article is for educational purposes only and does not constitute financial advice. Past performance is not a reliable indicator of future results. Always consider your personal circumstances and consult a qualified financial adviser before making investment decisions.

This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making decisions about your health.