What is a good HRV by age?

A quick refresher on what HRV is

Heart rate variability measures the tiny differences in timing between consecutive heartbeats. Even at a steady 60 beats per minute, the gaps between beats aren't identical, and that variation is the signal. It's reported in milliseconds, and higher generally means your nervous system has spare capacity to rest and recover. Lower readings tend to show up under stress, illness, poor sleep, alcohol, or hard training you haven't recovered from.

Most overnight readings for adults land somewhere between 20 ms and 100 ms, but that range is wide for a reason. Where you fall inside it depends heavily on age and genetics, which is exactly why a single chart can't tell you whether your number is good.

Typical HRV ranges by age

The numbers below are rough population averages for rMSSD, the measure most recovery-focused wearables use. Treat them as orientation, not targets. Individual variation within any age group is large, often 30 to 40 ms between people of the same age, so a value outside these bands isn't automatically a problem.

In your twenties, averages tend to sit around 50 to 65 ms, and the youngest adults often run higher still. Through your thirties they typically slide to roughly 40 to 50 ms, and in your forties to around 30 to 40 ms. By your fifties many people see something near 25 to 35 ms, and from sixty onward averages commonly fall to around 20 to 25 ms or lower. The downward drift is normal: HRV tends to decline on the order of a few milliseconds per decade as parasympathetic activity eases and arteries stiffen.

Two patterns are worth knowing. Women often show slightly higher readings than men in younger age groups, with the gap narrowing and largely disappearing by the mid-fifties. And trained endurance athletes frequently measure well above the averages for their age, sometimes by a wide margin, because regular aerobic training builds exactly the parasympathetic capacity HRV reflects.

Why your Apple Watch number won't match the chart

Here's the catch that trips up almost everyone. Apple Watch reports HRV as SDNN, while the population ranges above and the figures most recovery apps publish are based on rMSSD. They measure different aspects of the same heartbeat timing, and SDNN values from an Apple Watch tend to read higher than rMSSD from the same person on another device. Oura, WHOOP, and Garmin lean on rMSSD; Apple does not.

The practical consequence is simple: don't benchmark your Apple Watch SDNN reading against an rMSSD-based chart. You'll either panic over a number that looks low or feel falsely reassured by one that looks high. Comparing across devices at all is shaky, because sampling windows, algorithms, and measurement times differ. The only fair comparison is your readings against your own readings, taken the same way each night.

Why your own trend beats any table

A population average answers a question you don't really have. You don't need to know whether you're typical for a 38-year-old; you need to know whether you're recovering well right now and which way you're heading. A reading of 45 ms could be excellent for one person and a quiet warning for another, so the absolute figure carries far less meaning than its movement over weeks.

This is why tracking against your personal baseline works better than chasing a chart. Build up a few weeks of consistent overnight readings and your normal range emerges. After that, a morning that drops well below your own baseline is informative in a way that no age table can be, and a slow climb over months usually means your training, sleep, and stress are genuinely heading the right way. Beebsi reads your HRV from Apple Health, judges each reading against your own history rather than a stranger's, and folds it into your recovery picture so you aren't left interpreting a raw millisecond figure on its own.

What shifts your HRV besides age

Age sets the rough territory, but plenty of day-to-day factors move HRV inside it, and most of them are short-term rather than permanent. Sleep is the big one: a short or broken night usually shows up as a lower reading the next morning. Alcohol is reliably suppressive, often dropping HRV for a night or two even after a couple of drinks. A late, heavy meal can do the same. So can a hard training session, dehydration, a stressful day, or the first stirrings of a cold before you feel any symptoms.

None of that should worry you on its own. It's the reason an isolated low reading is close to meaningless and the trend matters so much. What you're looking for is the pattern: a string of low mornings that lines up with a busy work stretch, travel, or a heavy training block is your body asking for a lighter load. A steady climb over weeks usually tracks with better sleep, sensible training, and fitness that's genuinely improving rather than any single good night.

How to get readings worth comparing

Consistency is everything. HRV is sensitive to when and how it's measured, so the most reliable signal comes from overnight readings taken automatically while you sleep, which is what a watch worn to bed gives you. Spot checks during the day bounce around with posture, caffeine, and stress, and they're hard to compare from one day to the next.

Then give it time. A single morning means almost nothing; the trend over a week or two is the part that reflects how you're actually doing. If you want the fuller picture of how HRV ties into recovery, the HRV tracking and recovery score guides go deeper into how the pieces fit together.