Chronological vs. Biological Age
Your chronological age is the number of years you've been alive. Your biological age is an estimate of how old your body seems based on markers of health and aging. Two people who are both 50 can have very different biological ages.
How Is Biological Age Measured?
Epigenetic clocks: These tests analyze chemical tags on your DNA (DNA methylation) that change with age. Examples include clocks developed by researchers like Horvath and newer "pace of aging" tests. Some are available as consumer tests.
Blood-based biomarker scores: Some calculations combine common lab results—like blood sugar, cholesterol, inflammation markers, kidney function, and blood counts—to estimate biological age.
Functional measures: Fitness and physical function are strong indicators of how well you're aging, including:
- VO2 max (cardiorespiratory fitness)
- Grip strength
- Walking speed
- Balance
How Accurate Are These Tests?
- Biological age tests are useful research tools, but consumer tests can vary between companies and even between repeat tests
- They're best used to track trends over time rather than as a precise number
- They're not diagnostic tools and shouldn't replace standard medical care
Can You Lower Your Biological Age?
Research suggests that healthy habits are associated with younger biological age, and some small studies have shown changes in epigenetic markers with lifestyle interventions. The habits most consistently linked to healthier aging include:
- Regular aerobic exercise and strength training
- A diet rich in whole foods and plants
- Quality sleep
- Not smoking and limiting alcohol
- Healthy body weight and metabolic health
- Stress management
- Strong social connections
Improving measurable markers—like blood pressure, blood sugar, cholesterol, fitness, and strength—is a practical way to improve your health span, regardless of what any single test says.
Track What Matters
Comprehensive lab testing gives you concrete numbers to monitor and improve over time.
Learn more about lab testing here: Heva Lab Testing
The Bottom Line
Biological age tests can offer interesting insight, but they're best used to track trends. The habits that improve your fitness, metabolism, and overall health are the most reliable ways to age more slowly.