A VO2 max of 52 mL/kg/min is not just good, it’s excellent. For every age group except men in their 20s, this score lands above the 95th percentile, meaning you’d outperform at least 95 out of 100 people your age on a cardiorespiratory fitness test. Even for a man in his 20s, 52 still places between the 80th and 85th percentiles, which is well above average.
How 52 Compares by Age and Sex
Context matters enormously with VO2 max because the score’s meaning shifts depending on who you are. A number that’s merely strong for a 25-year-old man can be extraordinary for a 50-year-old woman. Here’s how 52 stacks up across the board.
For men aged 20 to 29, the 80th percentile sits at 51.4 and the 85th at 53.9, so a score of 52 falls right between those marks. That’s solidly above average but not yet elite for this youngest group. By the time you reach 30 to 39, though, the 95th percentile drops to 44.7, and 52 blows past it. The gap only widens with age: the 95th percentile for men in their 40s is 41.9, in their 50s it’s 37.4, and in their 60s it’s 32.4.
For women, 52 exceeds the 95th percentile in every age bracket. The highest female benchmark in the data is 45.2 at the 95th percentile for women aged 20 to 29. A woman scoring 52 is performing at an exceptional level regardless of age.
What 52 Means in Practical Terms
VO2 max measures the maximum amount of oxygen your body can use during intense exercise, expressed in milliliters per kilogram of body weight per minute. One MET, the baseline unit of metabolic effort, equals 3.5 mL/kg/min. A VO2 max of 52 translates to roughly 14.9 METs, meaning your body can sustain activity at nearly 15 times its resting energy expenditure.
In real life, that capacity supports activities like running at a fast pace, competitive cycling, vigorous swimming, and high-intensity interval training without hitting a wall. You have a large aerobic reserve, which means everyday tasks like climbing stairs, carrying groceries, or playing with kids barely register as effort. That reserve also acts as a buffer against the natural decline in fitness that comes with aging, giving you more room to lose capacity over the decades while still functioning at a high level.
Where 52 Sits Among Athletes
If you’re wondering whether 52 makes you “athletic,” the answer is yes, but the athletic spectrum is wide. Recreational marathon runners typically have VO2 max values in the mid-40s to mid-50s. Participants in the 2024 London Marathon, for example, averaged around 56.7 mL/kg/min before the race. Regular triathletes tend to average close to 60. Elite endurance athletes often land in the 70s or higher.
A score of 52 puts you comfortably in recreational competitive territory. You could train for and finish a marathon, compete in local triathlons, or hold your own in most amateur endurance events. You’re not at the level of someone training full-time for elite competition, but you’re well above the general population and solidly within the range of people who take fitness seriously.
Why This Number Matters for Longevity
VO2 max is one of the strongest predictors of how long you’ll live, independent of other risk factors. A large population study published in Mayo Clinic Proceedings found that each 1 mL/kg/min improvement in VO2 max over time was associated with a 9% reduction in all-cause mortality, after adjusting for blood pressure, cholesterol, smoking, BMI, diabetes, and other variables. That’s a striking relationship: small improvements in cardiorespiratory fitness translate into meaningful reductions in death risk from any cause.
At 52, you’re carrying a substantial fitness advantage. Someone with a VO2 max of 35 (closer to average for a middle-aged adult) would need to gain 17 points to reach your level, and every single one of those points carries protective value. The research suggests there’s no ceiling where higher fitness stops being beneficial, so maintaining or even slightly improving your current score continues to pay dividends.
How VO2 Max Changes With Age
VO2 max declines naturally at a rate of roughly 1% per year after your mid-20s in sedentary individuals, and about 0.5% per year in people who stay active. At 52 now, even with gradual decline, you’re positioned to maintain above-average fitness for decades. A person who starts at 52 in their 30s and stays active might still have a VO2 max in the low 40s by their 60s, which would remain above the 95th percentile for that age group.
The key factor in slowing that decline is consistent training that includes both moderate-intensity endurance work and occasional high-intensity efforts. High-intensity interval training in particular has been shown to preserve VO2 max more effectively than steady-state cardio alone. If you’re already at 52, whatever you’ve been doing is working, and continuing that approach is your best strategy for keeping it there.
How Accurate Is Your Number?
Where your 52 came from matters. A lab-based test using a mask that measures oxygen and carbon dioxide while you exercise to exhaustion on a treadmill or bike is the gold standard, and that number you can trust completely. Fitness watches and smartwatches estimate VO2 max using heart rate data and algorithms, and these estimates can be off by 5 to 10% in either direction. A watch estimate of 52 likely means your true value is somewhere between 47 and 57, which is still a strong range but worth keeping in mind.
Submaximal tests, where you exercise at moderate intensity and a formula predicts your max, also carry a margin of error. If you scored 52 on a submaximal gym test, the true value could be a few points higher or lower. Regardless of the method, a score in the low 50s consistently places you well above average for the general population.