We all know our chronological age. But those interested in longevity, rejuvenation, and biohacking pay more attention to biological age — a marker that reflects how well the body functions compared to other people of the same age.
Two people of the same age can age very differently: one may have the health profile of a 35-year-old, while the other may function more like a 45-year-old. Faster biological aging is often associated with chronic health issues and a shorter lifespan. That is why people who want to stay healthy, active, and energetic for longer are increasingly asking: can biological age actually be measured, and is it possible to improve it?
Revita Clinic is a biological longevity clinic in Slovenia, where the focus goes beyond relaxation and wellness — focusing on gentle recovery, sustainable health, and improving biological age. To support this, the clinic has developed six personalized programs: Detox & Microbiome, Anti-Stress & Burnout, Anti-Age & Longevity, Weight Management, Women’s Health, and General Health Improvement.
Each program has its own focus, but all of them take a comprehensive approach to the key pillars of longevity: nutrition, sleep, physical activity, emotional balance, immune health, gut health, and energy restoration.
At Revita Clinic, we look beyond isolated symptoms and focus on the body as a whole — because long-term health, vitality, and quality of life require a truly systemic approach. A Revita Clinic wellness consultant will help you choose the recovery program that best fits your current condition and personal goals.
Knowing your biological age could give you a more accurate picture of your health than simply relying on an annual GP visit. Many people appear perfectly healthy right up until something goes seriously wrong. At that point, it is already too late. Biological age may reveal accelerated aging much earlier.
It is not, however, 100% predictive of any specific health outcome. You might have a high biological age and never develop a particular condition. A low biological age does not guarantee immunity from health problems either. But the information can help guide lifestyle decisions — and crucially, it can show you whether the changes you are making are actually having an effect.
Measuring Biological Age: The Current State of the Science
We currently do not have a single definitive standard for measuring biological age. Researchers are working with a number of different approaches, each with varying degrees of accuracy and reliability.
One of the leading methods involves measuring epigenetic age, sometimes called an epigenetic clock. These assessments examine DNA methylation — chemical markers that sit on top of your DNA and shift as you age. The Horvath clock is the most well-known of these, developed by Steve Horvath. Since then, more sophisticated clocks have emerged, including GrimAge and DunedinPACE, which aim to predict not just biological age but also mortality risk and the actual pace of aging.
A more common approach involves analyzing a broad panel of blood biomarkers. Tests like these look at dozens of markers covering inflammatory responses, metabolic health, hormone levels, liver and kidney function, and cardiovascular health. Companies such as InsideTracker and Function Health offer this kind of testing, often combining blood data with lifestyle and physical metrics.
A newer generation of tests also measures things like telomere length, proteomic aging, and glycan age. Each of these has its own strengths and limitations — and none of them is perfect.
Currently Popular Biological Age Tests
As interest in this space has grown, a number of consumer-facing biological age tests have come to market. A few of the most prominent ones include:
- TruDiagnostic — One of the more sophisticated epigenetic tests available, using the DunedinPACE algorithm. It is on the expensive side, but you get a substantial amount of data for the price.
- InsideTracker — Focuses on the breadth of biomarkers measured from a blood sample, with an emphasis on actionable recommendations based on your results. A popular choice for people who already use testing as a core part of their health practice.
- DunedinPACE — Measures your pace of biological aging rather than a static age number. Many researchers consider this one of the stronger options currently available.
- MyDNAge — A more simplified epigenetic test, and more affordable than many competitors in the space.
All of these vary in quality and utility. Some people find the results genuinely useful; others feel they do not match their lived experience. That is not unusual for biomarker testing in general.
Which Longevity Biomarkers Matter Most?
Longevity biomarkers can broadly be defined as any measurable marker associated with lifespan or healthspan. Some carry more weight than others. A few that consistently appear in the research as strong predictors include:
- High-sensitivity CRP — a marker of systemic inflammation
- HbA1c and fasting insulin — markers of metabolic health
- VO2 max — a measure of cardiorespiratory fitness
- Hormone levels — particularly IGF-1 and testosterone in men
- Liver enzymes and kidney function markers
- Inflammatory cytokines
More advanced longevity assessments do not just look at a handful of these — they combine multiple factors to build a more complete picture. Even so, interpreting what these numbers actually mean for your future health is still not straightforward.
How Accurate Are Biological Age Tests, Really?
This is where things get complicated. Epigenetic clocks are improving, but they are still imperfect. Two different tests may give you meaningfully different numbers. Your biological age can also shift based on short-term factors — stress, illness, fatigue, even the time of year.
Many scientists treat the current generation of biological age tests as useful experiments rather than definitive measurements. They are probably best used longitudinally — tracking a series of readings over time rather than putting too much weight on a single number. Seeing a downward trend after a sustained lifestyle change, for example, is far more meaningful than any one result.
Can You Actually Reduce Your Biological Age?
This is probably the most common question in this space. The short answer is: yes, but only up to a point.
The things consistently shown to help include:
- Resistance training
- Regular moderate cardio, especially Zone 2
- Good sleep
- Stress management
- Adequate protein intake
- Limiting ultra-processed food
- Not smoking or drinking heavily
Some people also take specific supplements — rapamycin, metformin, NMN — that have shown promising results in some studies. But the science in otherwise healthy individuals is still early, and none of these should be considered a shortcut around the basics. Some studies have shown that biological age can be reduced by several years following sustained lifestyle interventions over 6 to 12 months — at least for some people.
What to Know Before You Take a Biological Age Test
It is worth pausing before spending money on a biological age test. The science is still evolving, results can create unnecessary anxiety, and some people get either falsely alarmed or falsely reassured by a single number. It also bears repeating: the biggest drivers of biological age change are long-term lifestyle habits. The test itself does not do anything. What you do with the results matters far more than the number you receive.
The Bottom Line
Biological age is a genuinely interesting concept, and the testing landscape is improving. Current methods are not perfect, but they can be a useful tool for assessing whether your lifestyle is supporting your long-term health — especially if you test again after making changes and track the trajectory over time.
If you are curious, pick a reputable test, keep your expectations realistic, and remember that it is one data point among many. Your energy levels, physical fitness, sleep quality, and other health markers all tell a story too. Biological age is ultimately a tool — what counts is whether you use it to make better decisions.
