What's a Good HRV for Your Age?

If you’re tracking heart rate variability (HRV) on your Apple Watch or other device, you’ve probably wondered: what’s a good HRV by age? The answer isn’t as simple as a single number. While age-based averages exist, your individual baseline and personal trends tell you much more about your stress and recovery than comparing yourself to strangers.

Let’s look at what the research shows about HRV across different ages, and why your own pattern matters more than any chart.

Average HRV by Age Group

HRV naturally declines as you get older. This happens because your autonomic nervous system becomes less flexible over time. Here are rough averages for resting HRV measured in milliseconds (RMSSD, the most common metric):

Ages 20-25: 55-105 ms
Ages 26-35: 45-90 ms
Ages 36-45: 35-75 ms
Ages 46-55: 25-65 ms
Ages 56-65: 20-55 ms
Ages 65+: 15-45 ms

These ranges come from studies of healthy adults. But there’s massive variation within each age group. A 30-year-old athlete might have an HRV of 120 ms, while a sedentary 30-year-old could sit at 35 ms. Both could be “normal” for their individual circumstances.

Women tend to have slightly lower HRV than men on average, though this gap shrinks after menopause. Your fitness level, sleep quality, stress, and genetics all influence where you fall in the normal range.

Why Your Personal Baseline Matters More

Looking up “good HRV by age” might seem helpful, but comparing yourself to population averages misses the point. What really matters is your HRV compared to your own baseline.

Here’s why: if your normal HRV is 40 ms and it drops to 25 ms, that’s a red flag. Your body is showing signs of stress, poor recovery, or overtraining. But if someone else’s HRV is always 25 ms and stays there, they’re fine.

Think of HRV like blood pressure. One person might run at 110/70 normally, another at 125/80. Both are healthy. But if the first person suddenly jumps to 140/90, something changed. The trend matters more than the absolute number.

Track your HRV for at least two weeks to establish your personal baseline. Look for patterns:

Does your HRV drop after alcohol or poor sleep?
Does it rise on rest days?
Do you feel worse when your HRV is low?

These personal correlations are far more useful than worrying whether you match an age-based chart.

Factors That Affect HRV Besides Age

Age isn’t the only thing that determines your HRV. Understanding these other factors helps explain why your number might differ from expected ranges:

Fitness level: Regular aerobic exercise increases HRV over time. Endurance athletes often have much higher HRV than sedentary people their age.

Sleep quality: Poor sleep crushes HRV. Even one bad night can drop your reading the next morning.

Stress and cortisol: Chronic stress keeps your sympathetic nervous system activated, which lowers HRV. This is why HRV works as a stress indicator.

Training load: Intense workouts temporarily lower HRV. This is normal. But if it stays low for days, you might be overtraining.

Illness: Getting sick tanks your HRV before you even feel symptoms. Many people use this as an early warning system.

Time of day: HRV is typically highest when you first wake up, which is why most people measure it first thing in the morning.

Measurement method: Wrist-based sensors are convenient but less accurate than chest straps. Your device matters.

When to Worry About Low HRV

A single low reading isn’t a crisis. HRV fluctuates daily. But consistent patterns deserve attention.

You might want to investigate further if:

Your HRV drops 20% or more below your baseline for several days
You feel exhausted, irritable, or can’t recover from workouts
Your HRV keeps declining week after week
Low HRV comes with other symptoms like chest pain or dizziness

Low HRV often signals that your body needs rest. For athletes, it might mean taking a recovery day. For everyone else, it might mean addressing sleep, stress, or lifestyle factors.

High HRV isn’t automatically better either. Unusually high readings (for you) can sometimes indicate overtraining or illness, though this is less common.

Track Your Stress and Recovery Patterns

Want to see how different factors affect your nervous system? Our stress score calculator helps you identify what might be impacting your HRV and overall recovery based on your habits and symptoms.

The Cortisol+ app on Apple Watch tracks HRV and estimates cortisol patterns continuously throughout the day. Instead of just a morning snapshot, you can see how your nervous system responds to actual stressors and recovery activities. This gives you a clearer picture of what really moves your personal trend.

Not medical advice. Consult a healthcare provider for diagnosis or treatment.