There is no single “good” HRV score. Heart rate variability is highly individual, and a number that’s perfectly healthy for one person may be low for another. That said, population data gives useful benchmarks: a 25-year-old typically falls somewhere between 50 and 100 milliseconds, while a 45-year-old more commonly lands between 35 and 60 ms. HRV declines naturally with age, so comparing yourself to your own baseline over time matters more than chasing someone else’s number.
Typical HRV Ranges by Age
The most comprehensive real-world data comes from wearable devices tracking hundreds of thousands of users. Across all users on the WHOOP platform, the average HRV for men is 65 ms and for women is 62 ms. But averages can be misleading. The most common (median) HRV score is actually around 40 ms for men and 37 ms for women, meaning a large number of high scores pull the average upward.
Here’s how the middle 50% of users break down by age, based on population data from WHOOP:
- Age 25: Men roughly 50 to 100 ms, women roughly 45 to 90 ms
- Age 45: Men roughly 35 to 60 ms, women roughly 30 to 55 ms
If your HRV falls within these ranges for your age group, you’re in the middle of the pack. Falling above suggests strong cardiovascular fitness and autonomic health. Falling below doesn’t necessarily signal a problem, but a consistently low or rapidly declining HRV is worth paying attention to.
Why HRV Drops as You Age
HRV reflects how well your autonomic nervous system balances its two branches: the sympathetic side (your “fight or flight” accelerator) and the parasympathetic side (your “rest and digest” brake). Higher HRV means these two systems are flexibly responding to your environment. Lower HRV means the system has become more rigid.
As you age, this balance shifts. The sympathetic side becomes more dominant, creating a low-grade inflammatory state, while the parasympathetic side loses influence. This parasympathetic decline is particularly important because it weakens one of the body’s built-in anti-inflammatory pathways. Researchers now consider this autonomic imbalance one of the key drivers of age-related disease, not just a symptom of getting older.
Men and Women Age Differently
HRV doesn’t decline the same way in men and women. Research from Washington University compared healthy adults around age 33 with those around age 67 and found striking differences. In men, aging brought a broad reduction across nearly every HRV measure, reflecting losses in both sympathetic and parasympathetic function and a flattening of the normal day-night rhythm. Younger men started with significantly higher HRV than younger women, but by older age, the gap between sexes disappeared.
Women showed a more selective decline. Older women primarily lost shorter-term HRV measures (the beat-to-beat variation driven by the parasympathetic nervous system) while maintaining their circadian variability. In practical terms, this means women’s autonomic systems appear to age in a more targeted way, preserving some functions that men lose. The convergence by older age is notable: if you’re over 60, the typical ranges for men and women are essentially the same.
Fitness Makes a Real Difference
Exercise is one of the strongest modifiable factors for HRV. Physically active people consistently show higher HRV than sedentary people of the same age, and the difference isn’t just in the raw number. Studies comparing active and sedentary young adults found that exercisers had a more favorable balance between sympathetic and parasympathetic activity. Their nervous systems were better at switching into recovery mode.
This is one reason a fit 50-year-old can have HRV numbers that look like those of an average 30-year-old. Regular aerobic exercise, strength training, quality sleep, and stress management all support parasympathetic function. If your HRV is on the lower end for your age group, these are the most evidence-backed ways to improve it.
Your Baseline Matters More Than Any Chart
Cleveland Clinic notes that HRV is genuinely difficult to interpret, and variability that’s normal for one person may not be normal for another. Population charts give you a rough sense of where you stand, but they can’t account for your genetics, medications, chronic conditions, or measurement method. A wrist-worn device, a chest strap, and a clinical ECG will all produce different numbers from the same person.
The most useful approach is to track your own HRV over weeks and months, looking for trends rather than fixating on daily readings. A single low reading after a poor night of sleep or a hard workout means very little. A steady downward trend over several weeks, or a score that stays far below your personal average for days, can signal overtraining, illness, or chronic stress. A rising trend over months often reflects improving fitness or better recovery habits.
When Low HRV Signals a Health Concern
For most people checking a wearable, a low HRV score is a nudge to sleep better or ease up on training, not a medical emergency. But persistently very low HRV does carry clinical significance. In a study of centenarians published in Frontiers in Physiology, those whose overall HRV (measured by a metric called SDNN) dropped below 19 ms had a nearly six-fold higher risk of dying within one year compared to those above that threshold. That’s an extreme population, but it illustrates the principle: at very low levels, HRV becomes a meaningful marker of how much reserve the body has left.
For younger and middle-aged adults, there’s no single cutoff that defines “dangerously low.” What matters is context. An HRV that’s consistently well below the typical range for your age, combined with symptoms like fatigue, poor exercise tolerance, or slow recovery, is worth discussing with a healthcare provider. The number alone doesn’t tell the whole story, but paired with how you feel and how you function, it adds a useful data point.