What is a good HRV for my age? Ranges, and the number that matters

It is one of the most searched questions in fitness, and it has a straight answer that fits in a sentence: a good HRV is one that is stable or rising against your own baseline. Here is how to get from that sentence to something you can use tomorrow morning, including the population ranges, with the caveat they deserve.

What is HRV, in one paragraph?

Heart-rate variability is the variation in the time between consecutive heartbeats. At 60 beats a minute your heart is not beating exactly once a second; one gap is 0.92 seconds, the next 1.02. That wobble is driven mostly by the parasympathetic nervous system, the part that handles rest and recovery, so more wobble generally means a body in a recovered state and less wobble means one under load, whether from training, illness, alcohol or stress.

Most wearables summarise it as RMSSD in milliseconds, usually from a window of overnight or on-waking data. Higher is generally better for you, relative to you. That last clause is the whole article.

What is the average HRV by age?

Large population datasets put the median somewhere around 60 to 70 ms in the twenties, drifting to roughly 30 to 40 ms by the fifties. The decline with age is real and steady. But the spread inside each age band is enormous: two healthy 40-year-olds can sit at 25 ms and 90 ms and both be fine. Fitness, genetics, alcohol, illness and the device itself all move the number more than a decade of age does.

So use the ranges only to sanity-check a device, never to grade yourself. A reading of 35 ms at 52 is unremarkable; a reading of 35 ms at 52 when your own normal is 55 ms is the thing worth noticing.

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What does a good HRV reading look like?

Three things make a morning HRV useful: it was measured in the same conditions (on waking, before coffee, same position), it is compared with your own rolling baseline, and it is read as a trend over a week, not a verdict about a day. Under those rules, "good" means within your normal range or above it, and "watch out" means several days in a row under it, especially with a rising resting heart rate.

The normal range is a band, not a line. Most apps draw it from the last seven days around a 30-day or 60-day average, and that is a reasonable way to do it by hand too: take your 30-day average, and treat anything within the usual day-to-day scatter as normal. The scatter is larger than most people expect; a 10 ms swing between consecutive mornings is ordinary.

What makes HRV go up or down?

In roughly descending order of how much they move the number for most people:

• Alcohol the night before, reliably and often dramatically, for a night or two.
• A hard session the day before. Expected, and not a reason to rest if you slept.
• Illness, often two days before you feel it. A sudden drop with no training explanation is worth noting.
• Heat, altitude, travel, and a late heavy meal.
• Breathing rate during the measurement, which is why devices insist on rest and why a slow-breathing reading is not comparable with a normal one.
• Psychological stress, which the sensors cannot distinguish from physical load.

Over months, the levers that raise it are the unglamorous ones: aerobic fitness, regular sleep, less alcohol, lower chronic stress. Day to day, you are mostly managing it rather than raising it.

Is HRV the same on every device?

No, and this matters more than the age tables. A chest strap measuring during a five-minute seated test, a ring measuring all night, and a watch sampling in windows during sleep are three different measurements that happen to share a unit. Each will give you a different absolute number for the same body. None of them is wrong; they are not comparable with each other, only with themselves.

This is why switching devices resets your baseline, and why a number quoted by a friend on a different device tells you nothing. The same logic applies to the readiness scores built on top of HRV; Garmin, Oura and Whoop can all be right while disagreeing. For trends, a wrist wearable worn consistently overnight is good enough.

How do you use HRV to decide training?

The research on steering a training plan by HRV is covered in what the trials say about HRV-guided training. The usable version fits in a short list.

1. Within your band: do the planned session.
2. Below the band for one day after hard work or a late night: train, keep it easy or cap the hard part.
3. Below the band for two or more days, especially with resting heart rate up: easy volume only, move quality work later.
4. Above the band: do the plan well. Do not add work.

HRV is one input, not the verdict. A readiness score blends it with sleep and recent load, which is why how readiness scores work is the natural next read. And if you are collecting one number to grade your fitness against your age, HRV is the wrong one; VO₂max for your age is the number with population norms that actually mean something.

Does HRV decline with age, and can you slow it?

It declines, steadily, through adult life, and no amount of training stops that. What training does is move you within your age band. A fit 55-year-old commonly sits above the median for the twenties, and a sedentary 30-year-old below the median for the fifties. The age effect is real; it is just smaller than the fitness effect, the sleep effect and the alcohol effect, which are the three you control.

That is the useful reframing of the question in the title. "Is my HRV good for my age?" has an answer that changes nothing. "Is my HRV going the right way against my own history?" has an answer that tells you whether the last three months of sleep, training and drinking are working for you or against you. The second question is the one a wearable can actually answer, and it is the one worth asking every few weeks rather than every morning.

Reading it with a coach

PeakU shows HRV as a status against your baseline, balanced, low or high, rather than a naked number, and pairs it with resting heart rate, sleep and load before it says anything about training. The Peak Score each morning names which of those moved it. If you want the one habit that makes the number worth having: measure at the same moment every morning, and look at the week.

Hen Eytan · Founder, UPeak

Builds the UPeak apps and writes up the research behind them.