The Odds One of Two Partners Dies Before 65

Ask two business partners in their early fifties how likely it is that one of them dies before they get to retire, and most will wave the question away. It feels like a one-in-a-hundred worry, the sort of thing that happens to other people. The actual chance a business partner dies before retirement is a good deal higher than that, and the reason is simple arithmetic that almost nobody does: there are two of you, so the risk that at least one of you dies is close to the two individual risks added together.

Worked from the national life tables rather than guessed at, the probability that at least one of two partners aged fifty dies within the next fifteen years — before either reaches sixty-five — is somewhere between about one in eight and nearly one in five, depending on whether the partners are men or women. That is not a remote possibility you can reasonably ignore. It is a real planning number, and it is the honest quantitative case for having something in place before it happens.

This article shows the calculation in full, using the Office for National Statistics figures, so you can see exactly where the number comes from and judge it for yourself.

The short answer: two lives change the sum

The mistake is to think about your own odds. Each partner privately reckons on their own chance of dying young, decides it is small, and stops there. But the risk to the partnership is not one person's chance of dying. It is the chance that either of you does, and that is a bigger number because there are two of you standing in front of it.

Think of it the way you would think about two coins. The chance of a single coin coming up heads is one in two. The chance that at least one of two coins comes up heads is three in four, not one in two, because there are more ways for it to happen. Mortality works the same way. Adding a second life does not leave the risk where it was; it pushes it up, and by an amount that surprises people every time.

Start with one life

The Office for National Statistics publishes national life tables that give, for each age, the probability of dying within a year. String those together across the years from fifty to sixty-five and you get the probability that a person aged exactly fifty dies before their sixty-fifth birthday.

On the most recent UK tables, that probability is close to 9.5% for a man and close to 6.2% for a woman. In other words, of a hundred men aged fifty, around nine or ten will not reach sixty-five; of a hundred women, around six.

Source: Office for National Statistics, National life tables, United Kingdom, 2022 to 2024, published under the Open Government Licence v3.0. The figures are derived from the number of survivors at exact age 50 and at exact age 65 in the UK period life tables.

Those single-life numbers are already worth sitting with. A one-in-ten chance of dying in the next fifteen years is not the vanishingly small risk most fifty-year-olds carry around in their heads. But the partnership question is about two lives, and that is where the figure climbs.

Now put two lives together

To combine two independent risks, you do not add them — that would overstate it slightly, by double-counting the sliver of chance in which both partners die. Instead you work out the chance that both survive, and subtract it from one. The chance at least one dies is one minus the chance that neither does.

For two male partners aged fifty, each with roughly a 9.5% chance of dying before sixty-five, the chance that both survive is about 0.905 multiplied by 0.905, which is about 0.819. So the chance that at least one dies is about 1 minus 0.819, or around 18%. Close to one in five.

The same sum for two women aged fifty gives around 12%. For a mixed pair — one man, one woman — it lands in between, at around 15%.

Source: Author's calculation from the Office for National Statistics National life tables, United Kingdom, 2022 to 2024, combining the single-life probabilities of dying between ages 50 and 65 on the assumption that the two lives are independent.

Sit those three numbers next to the one-in-a-hundred feeling most partners start with. Even the lowest of them, two women at around 12%, is roughly one in eight. The highest, two men at around 18%, is nearly one in five. Over the fifteen years a fifty-year-old still has to work, that is not an edge case. It is a live risk to the business every single one of those years.

Why this is the honest number, not a scare

It would be easy to inflate a figure like this, and the whole value of doing the arithmetic properly is lost if you do. So here is what the number is and is not.

It assumes the two lives are independent — that one partner's death does not change the other's chance of dying. For most business partners that is close enough to true. Where two people share a life in a way that exposes them to the same risks, the real figure would be a fraction different, which is why the calculation subtracts the small overlap rather than simply adding the two risks together.

It also uses period life tables, which take today's death rates at each age and apply them as if they will stay fixed. They are the standard reference, but they are a snapshot, not a forecast, and the ONS is explicit that they describe the population as a whole rather than any individual. The full detail on how a single person should read these figures is in our companion piece on your real chance of dying before 65, which walks the same tables for one life rather than two.

What the number cannot tell you about you

A life table is an average across everyone of a given age and sex. It knows nothing about the two specific people in your partnership. It does not know that one of you has never smoked and cycles to work, or that the other has a heart condition the family does not talk about. Two individuals can sit a long way either side of the population average, and no national figure can place you on that spread.

That cuts both ways, and it is the reason the honest version of this article stops short of telling you what will happen to you. The population number is the right tool for a planning decision — how seriously should two owners take this risk — and the wrong tool for a personal prediction. Use it to decide whether to act, not to convince yourself you are safe because you feel healthy. Underwriting, when you actually apply for cover, is where an insurer looks at the two real lives rather than the average.

What partners usually do about it

The standard response to this risk is not to hope, but to arrange for money to be there if the arithmetic catches up with you. The common structure is a cross option agreement — sometimes called a double option or buy-and-sell — under which the surviving partner has the option to buy the deceased's share and the deceased's family has the option to require them to. It is funded by a policy on each partner's life, so the money to complete the purchase exists on the day it is needed.

Done properly, this solves two problems at once. The survivor is not forced to run the business alongside a grieving family who have inherited a stake they never wanted and cannot easily sell. And the family is not left holding an illiquid slice of a private company with no buyer — a problem that is far worse when the couple were not married, because there is no spouse exemption to soften the inheritance tax position, as we explain in why unmarried partners get no inheritance tax exemption.

One point of structure matters more than most owners realise: the agreement is usually written as reciprocal options rather than a binding obligation to buy and sell. A binding contract for sale on death can cost the estate valuable business relief, whereas cross options achieve the same commercial result without that consequence — the reasoning is set out in our piece on why options, not an obligation, preserve business relief. And whatever you put in place, the valuation basis needs reviewing as the business grows, because cover arranged against a figure from five years ago will not stretch to a business worth twice as much today.

If none of this is in place and the calculation above has made the risk feel real, you can compare life insurance quotes and have an FCA-authorised broker price cover against each partner's life and the value of the business. The deeper structural risk — a business set up so that a single death leaves nobody able to act at all — is worth understanding too, and we cover it in the one-owner company where a single death creates deadlock. Where children rather than a co-owner will inherit, the fairness problem takes a different shape, covered in splitting a business fairly when one child runs it and the others do not.

Scotland and Northern Ireland

The arithmetic is the same wherever you trade: two lives, combined risk higher than one. The ONS publishes national life tables separately for England, Wales, Scotland and Northern Ireland as well as for the UK as a whole, and death rates are not identical across the four nations — mortality in Scotland, for example, runs somewhat higher than the UK average, so the equivalent Scottish figures would sit a little above the ones used here. The method does not change; only the exact input percentages do, and the ONS dataset gives the figure for each nation.

The legal frame around a partnership differs too. A Scottish partnership has its own legal personality, separate from the partners, which English and Welsh partnerships do not — and that affects how a deceased partner's share is dealt with, even though it does nothing to the underlying mortality risk. In every part of the UK, the sensible response to the number is the same: know that two lives raise the risk, and decide in advance where the money comes from if one of them is lost.

Frequently asked questions

What is the chance my business partner dies before we retire?

Higher than most owners assume, because two lives are exposed rather than one. On the current ONS national life tables, a person aged fifty has roughly a 6% to 10% chance of dying before sixty-five depending on sex, and the chance that at least one of two such partners dies over that period is close to the two figures added together, less the small overlap where both would die. For two partners aged fifty that works out at somewhere around 12% to 18%.

Where do these mortality figures come from?

ONS national life tables for the UK, which give the probability of dying within a year at each single year of age, based on registered deaths and population estimates over a three-year period. They describe the population as a whole rather than any individual, use current death rates held constant, and take no account of health, smoking or occupation. They are the standard reference for this kind of question, which is why they are used here rather than an insurer's own figures.

What do partners usually do about that risk?

Many put a cross option agreement in place, funded by policies on each partner's life, so the survivor has money available to buy the share and the family has a willing buyer. That keeps the business with the people running it and gives the family cash rather than an unsellable stake. Keeping the valuation basis under review matters as much as arranging the cover in the first place, because a figure that was right years ago will not match a business that has since grown.