Longevity
Last Updated
Jun 23, 2026
Table of contents
VO2 max is the single best measure of how well your heart, lungs, and muscles move oxygen, and one of the strongest predictors of how long you will live. It also falls with age, which is why the number only means something once you put it next to your decade.
This is a data-first look at VO2 max by age. Below you will find the research-backed norms for men and women charted by decade, what actually counts as a good score, how fast the decline accelerates as you get older, how powerfully fitness predicts mortality, and how much of the drop you can train back. Every figure is sourced.
VO2 max by age · the numbers
VO2 max by age, at a glance
Median VO2 max declines across the lifespan
Median (50th percentile) VO2 max for men, ml/kg/min, by age decade. FRIEND Registry treadmill data.
VO2 max peaks in the twenties and declines steadily from there. For men, the median falls from about 42.5 ml/kg/min in the 20s to roughly 22 by age 80, a drop of nearly half across the lifespan. The slide is gentle decade to decade and then steepens with age, which is the part most people underestimate.
FRIEND Registry (Kaminsky et al.), treadmill cardiopulmonary exercise testing, n=7,783 US adults. Values are 50th-percentile medians for men.
What is a good VO2 max by age and sex
VO2 max range by decade, men
5th to 95th percentile of VO2 max, ml/kg/min, men by decade. The band is the spread of the general population.
A single average hides how wide normal really is. Each band above runs from the 5th to the 95th percentile for that decade. A "good" score means landing in the upper part of your band: above the median is above average, and the 75th percentile or higher is genuinely strong. The same raw number tells a different story by age. A VO2 max of 40 ml/kg/min sits near the bottom of the range for a man in his 20s but is top-of-chart for a man in his 70s.
FRIEND Registry percentiles for men (Kaminsky et al.), as compiled by FitnessNorms. fitnessnorms.com
Where these percentiles come from
Distribution of VO2 max, men aged 30 to 39
Illustrative distribution of VO2 max (ml/kg/min) in men 30–39, with key percentile markers.
The norms come from the FRIEND Registry, the largest US reference for directly measured VO2 max, built from treadmill cardiopulmonary exercise tests. For men aged 30 to 39, the middle 90 percent run from about 28.7 to 54.3 ml/kg/min, with a median near 40. Your percentile, not the raw number, is what tells you where you stand.
Kaminsky et al., FRIEND Registry, Mayo Clinic Proceedings. Curve shown is illustrative of the percentile spread, not a measured histogram.
VO2 max by age and gender
Median VO2 max, men vs women, by decade
50th-percentile VO2 max, ml/kg/min. FRIEND Registry.
Women sit below men at every age, by about 8 ml/kg/min on average. This is physiology, not effort: men carry more hemoglobin, a larger heart and stroke volume, and more lean mass, all of which raise oxygen delivery. Because VO2 max is expressed per kilogram of bodyweight, body composition matters too. The practical takeaway is to compare yourself against your own age and sex, never against a single universal number.
FRIEND Registry medians for men and women (Kaminsky et al.), as compiled by FitnessNorms. fitnessnorms.com
Why VO2 max declines with age
The rate of decline accelerates with each decade
Approximate VO2 max loss per decade. Anchored to the Baltimore Longitudinal Study of Aging (3 to 6% in the 20s–30s, rising above 20% after 70); interior values illustrative.
For a long time the decline was assumed to be a steady 10 percent or so per decade. Longitudinal data overturned that. Following the same people over time, the Baltimore Longitudinal Study of Aging found the rate of loss accelerates, from roughly 3 to 6 percent per decade in the 20s and 30s to more than 20 percent per decade after 70, and the slide is steeper in men from the 40s onward. The engine behind it: a falling maximum heart rate, lower stroke volume, and shrinking muscle mass all reduce how much oxygen the body can use.
Fitness buys you years of physiological age
Because the decline accelerates, a higher starting VO2 max and continued training effectively push back the age at which you cross critical thresholds for independence and disease risk. Two people of the same age can differ by 20 or more years of functional capacity.
Fleg et al., Accelerated Longitudinal Decline of Aerobic Capacity, Circulation, 2005 (Baltimore Longitudinal Study of Aging). pubmed.ncbi.nlm.nih.gov
The signals that matter
What your VO2 max score is really telling you
VO2 max and mortality risk
Low fitness predicts death more strongly than common risk factors
Adjusted hazard ratio for all-cause mortality. Higher is worse. Reference is the fittest group.
VO2 max is not just a fitness score, it is one of the strongest predictors of how long you will live. In a Cleveland Clinic study of 122,007 adults, the least-fit group had a 5.04 times higher risk of death than the fittest, a larger effect than smoking, diabetes, or coronary artery disease. The benefit kept climbing with fitness, with no upper limit: even within the elite, fitter was better. The single biggest gain comes from moving off the very bottom, not from chasing an elite number.
Mandsager et al., Association of Cardiorespiratory Fitness With Long-term Mortality, JAMA Network Open, 2018 (n=122,007). jamanetwork.com
How to improve your VO2 max
What raises and lowers VO2 max
Direction and relative strength of common factors. Bar length reflects relative effect, not a measured percentage.
The decline is real, but a large share of it is trainable. With consistent aerobic work, most people raise VO2 max by 15 to 20 percent, enough to roll back a decade or more of age-related loss. The most effective recipe pairs a big aerobic base with short, hard intervals near maximum effort. Many wearables now estimate VO2 max, so you can track the trend between lab tests.
Trainability and MET conversion per ACSM exercise-physiology references; elite values per published athlete data; no-upper-limit finding per Mandsager et al., 2018.
Sources & references
- Kaminsky LA, et al. Reference Standards for Cardiorespiratory Fitness (FRIEND Registry). Mayo Clinic Proceedings. Percentile norms by age and sex. pmc.ncbi.nlm.nih.gov
- FRIEND Registry percentile tables for men and women, ages 20–79+, as compiled by FitnessNorms. fitnessnorms.com
- Fleg JL, et al. Accelerated Longitudinal Decline of Aerobic Capacity in Healthy Older Adults. Circulation, 2005 (Baltimore Longitudinal Study of Aging). pubmed.ncbi.nlm.nih.gov
- Mandsager K, et al. Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing. JAMA Network Open, 2018 (n=122,007). jamanetwork.com
- American College of Sports Medicine (ACSM) Guidelines for Exercise Testing and Prescription: MET conversion (1 MET = 3.5 ml/kg/min), trainability, and fitness categories.
This article is for general education and is not medical advice. VO2 max norms vary by test protocol (treadmill vs cycle) and by laboratory. Discuss your own results with a qualified clinician.
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