VO2 max is one of the strongest predictors of how long you'll live — the evidence for that is covered here. This article is about the other half of the question: how do you actually move the number, at whatever age you're starting from?
What Is a Good VO2 Max for My Age?
In the FRIEND registry — the most widely used US reference dataset — the median VO2 max for men aged 20-29 is about 48.0 ml/kg/min; for women the same age, about 37.6. From there, values fall roughly 10% per decade.
"Good" is therefore relative to your age and sex, not a fixed number. Most smartwatches already make that adjustment, translating the raw figure into "below average," "average," or "above average" against reference data much like FRIEND's. Day to day, that category is more useful than the raw number — a 55-year-old and a 25-year-old aren't competing on the same scale.
Can You Improve VO2 Max After 50?
Yes. A two-year randomized trial of 61 previously sedentary adults in their fifties is the clearest evidence: an 18% gain, alongside a partial reversal of age-related heart stiffening. The catch is dose — four to five supervised sessions a week for two full years, not an occasional walk. Smaller routines produce smaller gains, but the direction isn't in question: training past 50 moves VO2 max the same way it does at 30, just from a different starting point.
How Is VO2 Max Measured?
The gold standard is a lab-based cardiopulmonary exercise test: you run or pedal at increasing intensity while a mask directly measures the oxygen you consume.
Everything else is an estimate. Wearables infer VO2 max from heart rate, pace, and motion data — conveniently, but imperfectly: in a small 19-person validation study, the Apple Watch Series 7 was off by nearly 16% on average against the lab, overestimating the least fit and underestimating the fittest.
That error matters less if you stick with one device and watch the trend rather than any single reading — which is exactly what Vivledia's weekly workout log next to the wearable estimate is for.
How Long Does It Take to Improve VO2 Max?
In the Norwegian 4x4 trial, eight weeks of interval training three times a week produced a 7.2% gain — a reasonable floor for how fast a measurable change can show up.
Larger gains take more time and volume: the Levine group's 18% improvement in previously sedentary 50-somethings took two years of four to five sessions a week. Most realistic training plans land somewhere between those two points — visible movement in weeks to months, scaling with how much time and intensity you put in.
What This Means for You
The evidence above points to two complementary training styles. Exercise is one of the four levers that actually move biological aging — this is what pulling that one looks like.
Norwegian 4x4 intervals, once or twice a week
Forty minutes total: a 10-minute warm-up, four rounds of 4 minutes hard with 3 minutes easy between, and a 5-minute cooldown. This is the protocol behind the Helgerud trial's 7.2% gain — the time-efficient lever for raising the aerobic ceiling.
Zone 2 training, three to four times a week
Thirty to forty-five minutes at a conversational pace — roughly 65-75% of max heart rate. This builds the aerobic base that interval work rests on, and it's the easier habit to keep, because it asks less of your recovery — which sleep, more than anything else, governs.
Track the pattern, not the single number
A single reading rarely changes behavior. The signal is the shape of your activity over weeks — how many sessions, how consistently, at what intensity. Logging workouts alongside a fitness estimate in Vivledia turns that shape into a trend you can actually see.
Neither protocol needs a gym or special equipment, and both are safe starting points for most healthy adults. Where they aren't — a known heart condition, years of inactivity, chest discomfort or unusual breathlessness during exertion — that call belongs with your clinician, not an article.
