Apple Health Age: what it means if you wear WHOOP, Oura or Garmin

Apple's keynote on 9 September brought new watches, but the bigger news was the health update. In February Apple had scaled back its plans for an AI health coach, as 9to5Mac reported, citing Bloomberg. What arrived instead is a Longevity tab with a score called Health Age, plus a daily training score for the watch called readiness.

WHOOP sells both kinds of score only with a membership, and Oura shows parts of them only to paying members. Apple has announced no fee.

If you wear a WHOOP, an Oura Ring or a Garmin, you probably want to know two things. Does Health Age work with your device, and does switching to an Apple Watch pay off? The first question is quick to answer. The second depends on how well Apple measures, how its scores compare with WHOOP's and what you pay over three years.

What did Apple announce for your health?

Four changes touch your health directly. Only readiness and the new sensors are already available in Germany, and the rest arrives later this year. Apple's launch announcement has the details.

• The Longevity tab with Health Age rates your data across seven areas, from heart and sleep to metabolic health and hearing. It arrives with the redesigned Health app later this year, in US English first.
• Readiness tells you on a scale from 0 to 10 how much strain your body can take today. It needs a Series 12 or Ultra 4 and already works in Germany.
• The new heart sensors in the Series 12 and Ultra 4 read background heart rate 60 times as often as the Series 11 and HRV up to every five minutes.
• In the at-home checks, the iPhone camera tests strength and balance. A VO2 max test with a watch, AirPods Pro 3 or another heart rate sensor joins them, also with the new app.

All of this needs an iPhone with Apple Intelligence, which in practice means an iPhone 15 Pro or newer. Apple hasn't said which watches support Health Age, but every watch on watchOS 27 (Series 9 or later, SE 3, Ultra 2 or later) already records the inputs. If you bought an Ultra 3 last year, though, you get no readiness score. Apple thanks you for your service.

What is Apple Health Age and how is it calculated?

Health Age expresses your measurements as an age. If you are 45 and the app says 41, your numbers look better than is typical for your age.

Apple names four example inputs: VO2 max, resting heart rate, sleep and heart rate variability (HRV). VO2 max is how much oxygen your body can use at full effort. HRV tracks the tiny changes in timing between one heartbeat and the next.

Apple says the feature is "informed by the best available science", which is about as checkable as "the best iPhone we've ever made". So far Apple has published neither the formula nor a validation study.

The iOS 27.2 beta reveals a little more. According to Tech Between the Lines, each factor there shows how many years it adds or subtracts, and the score is recalculated every Monday.

You can add lab values such as HbA1c (your long-term blood sugar) and LDL from a lab report, but the basic score needs no blood, because Health Age isn't an epigenetic clock. Our guide to biological age tests explains the difference.

Does Apple Health Age work with WHOOP, Oura or Garmin?

Not on its own, because Health Age requires an Apple Watch. Your band or ring can't feed it data either. None of them writes HRV or VO2 max to Apple Health, and Oura and Garmin don't even write resting heart rate. Apple hasn't said whether their sleep data counts if you also wear a watch.

The table shows what each device writes to Apple Health and what you can do in the meantime.

Sources: support pages of Oura (21 September 2026), WHOOP and Garmin, Apple Newsroom (9 September 2026).

Why do WHOOP and Apple show different HRV numbers?

Apple Health stores HRV as SDNN, which measures how widely your beat-to-beat intervals spread overall. WHOOP and Oura report RMSSD, which measures how much each interval differs from the next. That mismatch is why WHOOP told DC Rainmaker in 2022 that it writes no HRV to Apple Health.

HealthKit gained an RMSSD data type in iOS 27, but Apple told DC Rainmaker for the Ultra 4 review that SDNN remains the input to Health Age. So compare each device only with itself over weeks. Our HRV norms by age give you a rough frame.

When does Apple Health Age come to Europe?

Apple has not given a date. The redesigned Health app has been in the iOS 27.2 beta since 16 September, but according to MacRumors it will arrive later in the year rather than with the final iOS 27.2. 9to5Mac reports that it needs US English as the device language.

Use the wait to get your lab values ready. In Germany the statutory Check-up 35 measures LDL and fasting glucose every three years from age 35. HbA1c isn't included, but your GP can add it at the same appointment for about €13 to €20.

That answers the first question. Your device alone won't get you Health Age, and Europe has no date yet. Whether switching pays off depends first on Apple's inputs. Do they predict how long you live, and does the wrist measure them well?

Do Health Age's four inputs predict how long you live?

Individually, yes. Each of the four is linked to death or heart disease in large studies. Fitness and resting heart rate, however, have been tracked for decades, sleep regularity only in recent years. The table shows one study per input.

Source: the original papers named in the last column.

The studies measure risk in different ways, so their numbers can't be ranked. Fitness still stands out. In Mandsager's data, below-average fitness carried as much risk as smoking or diabetes, and more fitness kept helping without an upper limit. The participants, however, were patients referred to Cleveland Clinic for a treadmill test, not a cross-section of the population.

Apple also measures differently from the studies. Health Age takes SDNN from short wrist readings rather than two hours of Holter ECG, and Apple hasn't said which sleep measure it uses. Above all, no study shows that a blend of all four, measured on a wrist, predicts anything.

How accurately does Apple Watch measure VO2 max?

The strongest input is also one of the shakiest on the wrist. In a validation study of the Apple Watch Series 10 with 35 young adults, the watch missed lab values by 13.2 percent on average, or 6.79 ml/kg/min. Most of that error ran one way, because the watch read 6.25 ml/kg/min low.

If that bias held for a woman in her forties, her lab VO2 max of 42 would read about 36 on the wrist. That would drop her from Good past Average to Fair without skipping a single workout.

The results have limits. The participants were young and very fit, and among the 18 women the bias was even larger, at about 8.6. Nor is it clear whether they apply to the Series 12's new sensors or to the Health app's at-home VO2 max test, which has no published validation yet. If your wrist says you are aging fast, a lab test in Munich settles it for about €129.

Resting heart rate, HRV and sleep are a different matter. They rely mainly on the optical heart rate sensor, where Apple claims a clear lead.

How accurately does Apple Watch measure heart rate?

Very accurately, at least according to Apple's own study, which put the Series 12 ahead of all six rivals tested, WHOOP and Oura included. For the heart rate accuracy study, 1,254 participants wore a Series 12 on one wrist and a rival on the other in July and August 2026. A Polar H10 ECG chest strap served as the reference.

In daily life most gaps were small, with Pixel, Huawei and Garmin within 1.5 beats per minute of Apple. In workouts every gap grew, to 4.7 bpm for WHOOP and 9.4 for Oura. Oura skipped strength training, because the company advises against lifting with the ring on.

How far can you trust Apple's study?

Far enough to believe the watch is accurate, but not that it beats the rest. Apple designed the study, ran three of its five sites and published it on its own website. In other words, the referee wore the home team's shirt.

The study also checked only how accurate a reading was, not how often a device gave one. According to Apple's own 2024 paper on its heart rate algorithms, the watch holds back readings when the signal is poor, so gaps cost it nothing. DC Rainmaker found such gaps on the Ultra 4, including 14 seconds without a pulse while rowing. If you never answer, you are never wrong.

Independent tests so far confirm the accuracy. Rob ter Horst, known as the Quantified Scientist, found curves almost identical to a Polar H10 in indoor cycling, as 9to5Mac reported, but overall about the same accuracy as the Series 11.

Heart rate holds up, then, while VO2 max reads low. From this raw material Apple builds its two scores, readiness and Health Age, and WHOOP has a counterpart to each.

Is Apple's readiness as good as WHOOP recovery?

Nobody can say yet, because no independent test has compared them. Both follow the same idea. The Apple Watch compares your overnight heart rate, respiratory rate, wrist temperature, HRV and blood oxygen with your baseline, then adds sleep and training load. For that you need to wear it in bed on 7 of the past 49 nights.

WHOOP's recovery is a score from 0 to 100 percent, built mainly from overnight HRV, resting heart rate, respiratory rate and sleep. Apple's readiness runs from 0 to 10 instead.

Whether training by such a score helps is barely studied. Apple's readiness support page itself warns that the score "should not be solely relied on to determine whether it is safe to exercise".

The closest test is a 2023 cardiac rehabilitation study in 46 heart patients. Those who eased off on low-HRV days gained as much VO2 max as those on a fixed plan, with about 31 fewer minutes of hard training. That lends a little support to easing off on bad days and none to pushing on good ones.

Is Apple Health Age as good as WHOOP Age?

On paper WHOOP Age is ahead. It already runs in Germany with the Peak and Life memberships, and WHOOP has shown far more of its working. Its Healthspan white paper turns six months of data into an effective age and adds a weekly Pace of Aging score.

WHOOP's nine contributors cover sleep, heart rate zones, strength training, steps, VO2 max, resting heart rate and lean body mass, but not HRV. WHOOP maps each one to published mortality risks and corrects for overlap. If you want to read the method, WHOOP Age wins. Neither company, however, has shown that its number predicts who actually lives longer. That study naturally takes a little longer than a product cycle.

Oura and Garmin take other routes. Oura's Cardiovascular Age estimates arterial stiffness from the pulse wave and needs a membership. Garmin's Fitness Age is free and draws on activity intensity, resting heart rate and BMI or body fat. In this product category, free is almost a unique selling point by now.

What does WHOOP still do better?

Beyond the scores, WHOOP still beats the Apple Watch in four places.

• Its battery lasts 14 days, and you charge it on the wrist with a slide-on pack. A Series 12 lasts up to 24 hours.
• It has no screen, so nothing lights up at dinner, and it is more comfortable to sleep in than a watch.
• It works with Android phones, where Apple Health doesn't exist.
• Its Journal lets you log habits such as alcohol or late meals and shows how each one moved your recovery. Apple has no equivalent.

I'll admit a bias. I prefer gadgets I pay for once, and a band that analyses my data only while I pay feels like a lease strapped to my wrist. That is WHOOP's real catch, because once you cancel, the band stops collecting and analysing.

What do Apple Watch, WHOOP, Oura and Garmin cost over three years?

A Series 12 costs €449 once. Three years of WHOOP cost €597 with One and €1,197 with Life, and WHOOP Age requires at least Peak at €792. The Oura Ring 5 comes to €639 including its membership, while the Garmin Venu 4 and Forerunner 970 cost €500 and €670 once.

Street prices often sit well below list, above all for Garmin and Oura, whereas WHOOP charges the full membership every year. An Apple Watch, on the other hand, needs an iPhone (a 15 Pro or newer for Health Age) and, after about three years, a new battery or a successor. So Apple has a subscription too, it just calls it an upgrade.

What else could €792 buy?

Put the €792 for three years of WHOOP Peak into things you then own, and it buys a small longevity lab.

Sources (German list prices, September 2026): Polar, Proheco, Labor Staber direct-to-consumer price list (Lp(a) once, rechecks without it), Gorilla Sports, medipreis.de; shoes at a typical list price.

The shoes are less of a joke than they look. A meta-analysis in The Lancet Public Health of 15 cohorts with 47,471 adults found 53 percent lower mortality in the most active quarter than in the least active.

Does switching to Apple Watch pay off?

Not yet. Your WHOOP, Oura or Garmin can't produce Health Age, and for now switching doesn't pay off either.

Price isn't the reason, since with a recent iPhone a Series 12 undercuts WHOOP Peak over three years. The reason is the evidence. VO2 max, the strongest input, reads low on the wrist. Readiness hasn't been tested against WHOOP recovery. And Health Age has neither reached Europe nor been validated.

So cancel nothing for now, but export your data so the choice stays open.

What can you do until Health Age arrives?

You can already read the four inputs in your device's app and judge them yourself.

1. Check your VO2 max (on Apple: Cardio Fitness) against our VO2 max calculator, keeping in mind that the wrist tends to read low.
2. Look at your 30-day average resting heart rate rather than a single morning, which swings with sleep and stress.
3. Compare your HRV with your own baseline over weeks, not with a friend's number from another device.
4. Check how regular your bedtimes are before you worry about total hours. In the Windred study, regularity predicted mortality better than duration did.

When Health Age does arrive and jumps by two years, ask which input moved. VO2 max is the one you can shift most, as our zone 2 and VO2 max guide shows. Our pace of aging test gives you a habit-based second opinion in two minutes.