How Many Good-Health Mornings Are Left? ONS Life Tables, Ages 20 to 60

“They do not give a true estimate of how long someone can expect to live on average.” That sentence is from the Office for National Statistics, in the bulletin that publishes the UK’s 2022 to 2024 life tables, and it is the best warning to read before doing any arithmetic with them.

So here is the arithmetic, with the warning attached. A 20-year-old man in the UK has about 21,800 mornings left on current mortality rates and a 20-year-old woman about 23,200. Those are the ONS figures converted into days. The second number is less often quoted: ONS also estimates that men spend about 77% of life in good general health and women about 73%, so the mornings you can fully use are fewer than the mornings you will see.

What does the ONS life table say about mornings left at 20 to 60?

I used the ONS National Life Tables for the United Kingdom, period expectation of life, 2022 to 2024 (published 10 December 2025), and read the ex column, which is the average number of further years of life at each exact age. I converted years to days at 365.25 and to weeks at 52.18 (one year is 365.25 days, divided by seven). A “remaining Saturday” is one per week, so it equals the weeks column.

Age	Men: years left	Men: mornings	Men: weeks and Saturdays	Women: years left	Women: mornings	Women: weeks and Saturdays
20	59.70	21,805	3,115	63.47	23,182	3,312
30	50.02	18,270	2,610	53.62	19,585	2,798
40	40.51	14,796	2,114	43.90	16,034	2,291
50	31.36	11,454	1,636	34.46	12,587	1,798
60	22.76	8,313	1,188	25.45	9,296	1,328

Years left are from ONS. Mornings and weeks are the author’s own calculation, rounded to whole numbers.

Two things about the table. It does not run out at 60: the 60-year-old row still holds more than 8,000 mornings, which is longer than most people picture. And the numbers are averages across everyone who reaches that age, some of whom will have decades more and some far fewer.

Is life expectancy a promise?

No. ONS describes period life expectancy as the average number of additional years a person would live if they experienced the mortality rates of a given period for the rest of their life. Nobody does. Rates change. ONS notes that UK male life expectancy at birth (79.1 years) remained slightly below its 2017 to 2019 level.

The figures also say nothing about you. They cannot see your health, your postcode or your family history. A table can say how many people of a given age survive another 40 years, but it cannot say which side of that line you are on.

What is the ‘later’ that people save their mornings for?

Burkeman’s Four Thousand Weeks (Farrar, Straus and Giroux, 2021) made the weeks version of this number famous, and Tim Urban’s “Your Life in Weeks” on Wait But Why (7 May 2014) drew it as a grid of 4,680 boxes for a 90-year life. Both are excellent at the feeling and neither is an actuarial table: they round an assumed lifespan. I covered the weeks arithmetic at ages 20 to 60 in Four Thousand Weeks, Subtracted, so this post adds the part those pieces skip.

The skipped part is that “later” is usually priced as if every future morning were the same as today’s. They are not, and the cost of waiting shows up in simple multiplication. Someone who starts a 20-minute morning habit at 40 instead of 30 gives up 10 years of mornings, which is about 3,650 sessions and roughly 1,220 hours. That is the author’s calculation, and it assumes the habit would actually have been kept up. It is a measure of the delay, not a forecast of what the habit would have produced.

How many of those mornings are in good health?

ONS defines healthy life expectancy from people’s own answers about their general health. It counts the expected years someone reports as “very good” or “good”. In the 2022 to 2024 UK release (published 19 February 2026), ONS gives healthy life expectancy at birth as 60.7 years for males, 77% of life, and 60.9 years for females, 73%. Both were the lowest since the series began in 2011 to 2013.

Set beside life expectancy at birth in the same years (79.1 and 83.0), the gap is about 18.4 years for men and 22.1 years for women. Those are my subtractions from two ONS figures, and “not in good health” here means a lower self-rating, not a diagnosis. Converted, the gap is roughly 960 weeks for men and 1,150 for women.

The gap also varies by place. ONS reports healthy life expectancy of 63.0 years for men in the South East of England and 57.0 in the North East, and the North East has been lowest in every period since the series started. A national average hides a spread of six years between two English regions.

What do these numbers not establish?

Several things, and they matter more than the table.

First, they do not say your last 18 to 22 years are bad ones. Self-rated health is a rating, not a diagnosis, and it measures how people describe their health, not what a clinician would record.

Second, you cannot subtract the birth-based healthy figure from your current age. At 60 that would leave you under a year of good health, which is plainly wrong, because the figure is an average across all births, including people who die young. ONS publishes separate figures at older ages, and they are higher (see the FAQ).

Third, nothing here shows that seeing the count makes anyone behave differently. The memento mori morning practice post goes through why the evidence for that is thinner than the philosophy. A very large number, 21,805, can feel like an endless supply. A very small number can feel like panic. Neither reliably changes what a person does at 6:30 on a Tuesday.

Fourth, the table is for the UK. US readers should use the CDC and NCHS life tables or the Social Security Administration period table, which would give somewhat different figures, and I did not recompute them here.

What is worth doing with the arithmetic?

The most useful reading is also the least dramatic. The mornings in the table are not a countdown. They are thousands of nearly identical starts, and what varies is when each one begins. Sleep timing has its own research: the Monash UK Biobank findings on sleep regularity show what the data does and does not say about consistency and mortality. Deep sleep also changes with age, which is the subject of sleep quality after forty, so mornings at 50 are not built the same way as mornings at 25.

A wake-up time is one of the few daily choices that someone else can verify in about thirty seconds, which is where an outside witness is useful; how DontSnooze works describes one way of arranging that.

The number worth keeping from the table is the pair, not either half of it: thousands of mornings ahead, with the later ones less likely to be in very good health. The supply is large and it is not equal across the years.

Mornings are also shaped by what surrounds them, which is why Ulrich’s window-view study and the Whitehall job-control data belong in the same conversation.

Sources

• Office for National Statistics, National life tables, UK: 2022 to 2024, release of 10 December 2025, and the reference-tables workbook (period expectation of life, ex and lx columns).
• Office for National Statistics, Health state life expectancies in the UK: 2022 to 2024, release of 19 February 2026 (main points page).
• Office for National Statistics, Health state life expectancies, England and Wales: 2021 to 2023, release of 12 December 2024 (main points page).
• Tim Urban, “Your Life in Weeks,” Wait But Why, 7 May 2014. Oliver Burkeman, Four Thousand Weeks (Farrar, Straus and Giroux, 2021); I did not have the book’s text, so nothing here is quoted from it.