What Is a Good VO2 Max by Age — and How to Improve It

Why VO2 Max Predicts How Long You Will Live

The landmark Mandsager et al. study published in JAMA Network Open (2018) followed 122,000 patients at the Cleveland Clinic over a median of 8.4 years. The finding was unambiguous: low cardiorespiratory fitness was associated with a higher adjusted mortality risk than smoking, hypertension, diabetes, and end-stage renal disease. Each 1-MET improvement in VO2 Max corresponded to a 10–25% reduction in all-cause mortality across every age group studied.

The American Heart Association's 2016 Scientific Statement, published in Circulation, formally recommended that cardiorespiratory fitness be treated as a clinical vital sign — alongside blood pressure, heart rate, and body temperature. Despite this, most routine checkups still do not measure it.

VO2 Max Reference Ranges by Age and Sex

The following ranges are derived from the American College of Sports Medicine (ACSM) normative data tables and the Cooper Institute's cross-sectional population studies. Values are in mL/kg/min.

Men

• Age 20–29: Poor <38 · Average 44–50 · Good 51–56 · Excellent >60
• Age 30–39: Poor <35 · Average 41–47 · Good 48–53 · Excellent >57
• Age 40–49: Poor <32 · Average 37–43 · Good 44–49 · Excellent >54
• Age 50–59: Poor <28 · Average 34–39 · Good 40–45 · Excellent >50
• Age 60+: Poor <22 · Average 27–32 · Good 33–38 · Excellent >43

Women

• Age 20–29: Poor <29 · Average 36–41 · Good 42–47 · Excellent >52
• Age 30–39: Poor <27 · Average 33–38 · Good 39–44 · Excellent >49
• Age 40–49: Poor <25 · Average 29–34 · Good 35–40 · Excellent >45
• Age 50–59: Poor <21 · Average 25–30 · Good 31–36 · Excellent >40
• Age 60+: Poor <18 · Average 22–26 · Good 27–32 · Excellent >36

The goal for longevity is not to be "average" for your age — it is to be in the top 20% of the cohort ten years younger than you. This gives you the reserve margin that matters when you need it most.

How VO2 Max Declines with Age — and Why It Does Not Have To

Untrained individuals lose approximately 10% of VO2 Max per decade after age 30, accelerating to 15% per decade after 60. This decline is driven by three mechanisms: decreased maximum heart rate (roughly 1 BPM per year), reduced cardiac stroke volume, and declining mitochondrial density in skeletal muscle.

The critical insight from longitudinal studies is that training largely reverses the muscle component and partially reverses the cardiac component. The 2012 Bhella et al. study in the Journal of the American College of Cardiology found that masters athletes who maintained structured training into their 70s had VO2 Max values 40% higher than sedentary peers of the same age — effectively shifting their biological clock a full decade.

The Two Training Protocols That Move the Needle

Research consistently shows that two modalities produce the largest VO2 Max gains when combined in the right ratio:

1. Zone 2 Training (80% of volume)

Zone 2 — defined as 60–70% of Heart Rate Reserve — is where fat oxidation peaks and mitochondrial biogenesis is maximally stimulated via PGC-1α activation. Dr. Iñigo San Millán's research with Tour de France athletes demonstrates that Zone 2 builds the aerobic base upon which all higher-intensity adaptations depend. For most adults, this means 3–4 sessions per week of 45–60 minutes of conversational-pace cardio: cycling, running, rowing, or brisk walking.

2. The Norwegian 4×4 Protocol (20% of volume)

Developed at the K.G. Jebsen Center of Exercise in Medicine, the 4×4 protocol consists of four 4-minute intervals at 90–95% of maximum heart rate, separated by 3-minute active recovery periods. This supramaximal stimulus drives cardiac output adaptations — specifically, increased stroke volume — that Zone 2 alone cannot produce. The original Helgerud et al. study in Medicine & Science in Sports & Exercise (2007) demonstrated 13% VO2 Max gains in 8 weeks in sedentary subjects.

Practical Tracking Protocol

Measure your resting heart rate every morning before getting out of bed for one week and take the average — this is your true RHR. Test your maximum heart rate with a chest-strap monitor during a genuine all-out effort (final 200m of a hard 1-mile run). Re-estimate every 8 weeks. A meaningful improvement is any increase of 2+ mL/kg/min, which corresponds to approximately one year of biological age reduction per the Mandsager mortality data.