Body data
What's a good HRV for your age?
If you've ever opened your ring or watch app, seen your HRV, and immediately typed “is that bad?” into a search bar — this is for you. The honest answer is that a “good” HRV depends heavily on your age, and even more on what's normal for you.
First, what HRV actually is
Heart-rate variability is the tiny variation in time between your heartbeats. A relaxed, well-recovered nervous system produces slightly uneven spacing between beats — and that unevenness is a good thing. Most wearables report it as RMSSD, measured in milliseconds, usually averaged while you sleep.
Higher generally reflects better recovery and more “rest-and-digest” activity. Lower often reflects stress, fatigue, or that you're fighting something off. But — and this is the part the apps rarely say clearly — the numbers are only meaningful in context.
Typical HRV ranges by age
Here's a broad, educational guide to typical RMSSD ranges. Think of these as “where most healthy people that age tend to land,” not as pass/fail lines:
| Age | Typical HRV (RMSSD) |
|---|---|
| Under 25 | 45–105 ms |
| 25–34 | 38–90 ms |
| 35–44 | 30–72 ms |
| 45–54 | 26–62 ms |
| 55–64 | 22–52 ms |
| 65 and over | 18–45 ms |
Notice how much the bands overlap and shift downward. A 52-year-old with an HRV of 35 ms and a 27-year-old with an HRV of 35 ms are in completely different situations — the first is comfortably typical, the second might want to look at their sleep.
Why HRV falls with age
As we get older, the nervous system's moment-to-moment flexibility gradually reduces, and average HRV drifts down with it. This is normal biology, not a personal failing or something to panic about. It's exactly why comparing your number to a friend a decade younger — or to a stranger's screenshot online — is close to meaningless.
The most useful HRV comparison isn't you versus other people. It's you versus you, last month.
“Low” is not the same as “bad”
A single low reading is usually just noise. The signal is the trend. If your baseline has been sliding down over two or three weeks, that's worth a gentle look. If yesterday was low because you had two glasses of wine and five hours of sleep, that's your body working exactly as designed.
Day to day, the things that most reliably pull HRV down are:
- Short or poor-quality sleep
- Alcohol — often the single biggest overnight hit
- Physical or emotional stress
- Illness or the day before you feel one coming on
- Dehydration
- A hard or unusually late workout
How to raise your baseline
If you want to nudge your HRV up over time, skip the gadgets and start with the boring, powerful basics:
- Protect your sleep window. Consistent sleep and wake times do more for HRV than almost anything else.
- Watch alcohol. Even a couple of drinks can flatten HRV for a night or two.
- Move gently and often. Regular easy aerobic activity builds the baseline; constant hard training can suppress it.
- Down-regulate stress. Slow breathing, time outside, and genuine rest days all count.
- Hydrate. Simple, and easy to forget.
Give any change a few weeks. HRV improves as a rising average, not as a better number tomorrow morning.
When to actually see a doctor
Check your own number
Ready to see where you land? The free HRV interpreter takes your age and average HRV and shows your typical range with a plain-English read-out — no sign-up, all in your browser.
Go deeper than one number
Your Body Data, Explained makes sense of HRV, sleep scores, recovery, CGMs, and AI health advice — calm, clear, and without the obsessing.