Biological Age Calculator
Find out how old your body actually is. Nine blood markers, peer-reviewed formula, no email gate. The result is a number you’ve never been given by your doctor โ and one of the most useful numbers in mid-life health.
Chronological age is the number on your driver’s license. Biological age is how old your body is actually behaving. The gap between them โ sometimes positive, sometimes negative โ is what determines how you’ll feel at 60, what diseases you’re likely to get, and how long you’ll live.
This calculator uses the PhenoAge formula, developed by Dr. Morgan Levine at Yale and published in the journal Aging in 2018. It was validated against more than 11,000 adults in the US National Health and Nutrition Examination Survey and is one of the most accurate biological age estimators that uses only standard blood tests. All nine markers come from a single comprehensive lab panel โ we recommend ApexBlood, our sister lab, which covers every input below.
No email gate. No identifying information. The result is yours.
How this works
PhenoAge combines nine standard blood biomarkers with chronological age into a single weighted score that maps to a “phenotypic age” โ the age at which someone with these biomarker values would have the same mortality risk in a healthy reference population. The formula was derived from mortality data on more than 11,000 adults and outperforms chronological age alone for predicting all-cause mortality, cardiovascular events, cancer incidence, and physical function decline.
Nine markers across six systems
Inflammation (CRP, white blood cells, lymphocytes), liver function (albumin, alkaline phosphatase), kidney function (creatinine), metabolic health (glucose), red blood cell health (MCV, RDW), and immune function. Together they form a composite picture of how the body is functioning at the cellular and systemic level โ not just whether anything is broken, but how well everything is working.
Statistically selected from hundreds
The original Levine study started with dozens of candidate biomarkers and used statistical modeling to identify the smallest set that best predicted mortality. These nine markers, weighted by their coefficients in the published equation, produce the strongest signal โ and importantly, all nine come from inexpensive, widely-available blood tests that any standard panel can include.
Enter your numbers
Default values shown are typical for a healthy 45-year-old โ replace them with your own results. Switch the unit system if your labs report in SI units (mmol/L for glucose, etc.).
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What’s driving your number
Each marker’s contribution relative to optimal. Green markers are protective; orange and red are pulling your biological age up.
Get your actual biological age.
The ApexBlood panel covers all nine PhenoAge markers โ including hs-CRP, which most basic panels skip โ plus 50+ additional biomarkers in a single draw. Rerun this calculator with your own numbers in about a week.
Order ApexBlood Panel โ $189 โHormones drive several of these markers.
Testosterone influences inflammation, glucose handling, body composition, and recovery โ which together affect at least five of the nine PhenoAge markers. If your bio age is running ahead of your chronological age, the hormonal angle is worth investigating directly.
Explore TRT Consultation โWhat the gap actually means
The relationship between biological age and chronological age โ what researchers call “age acceleration” โ is one of the most studied biomarkers in modern aging research. Multiple large cohort studies have shown that people whose biological age is significantly older than their chronological age have substantially higher risk of cardiovascular disease, cancer, type 2 diabetes, and all-cause mortality, independent of every other risk factor measured.
Your biomarker profile is meaningfully better than typical for your age. Associated with lower lifetime risk of most age-related diseases and substantially longer healthspan. This tier is uncommon and typically reflects consistent attention to sleep, training, body composition, hormonal status, and inflammation control. The longevity research is unambiguous: maintaining this profile into older age is the most impactful intervention available.
Your biological systems are functioning better than typical for your age. Associated with measurably lower risk of cardiovascular disease, metabolic dysfunction, and all-cause mortality compared to chronological peers. From here, small improvements in inflammation, glucose, and body composition can push you into the strongly protective range.
Your biology is roughly in line with your chronological age. Not a problem, but not yet protective. The biggest opportunity here is identifying which specific markers are slightly above optimal โ typically inflammation (CRP), glucose, or RDW โ and addressing them through targeted lifestyle and, where indicated, hormonal optimization.
Your biology is running ahead of your chronological age by enough to matter. The associations in the research are clear: this band carries meaningfully elevated risk of cardiovascular and metabolic disease over the next 10 to 20 years. The good news is that biological age is highly modifiable โ most men in this band can pull their PhenoAge back into alignment with their chronological age within 6 to 12 months by addressing the specific markers driving the gap.
Your biology is running well ahead of your chronological age. This pattern most often reflects metabolic dysfunction, chronic inflammation, suboptimal hormonal status, or some combination โ all of which are modifiable. This is also the band where targeted intervention produces the largest absolute reduction in long-term disease risk. A complete workup is high-yield: it tells you which specific systems are driving the gap and what the leverage points are.
A gap this large typically reflects multiple systems running suboptimally at once โ usually some combination of chronic inflammation, dysregulated glucose, suboptimal liver or kidney function, and frequently low testosterone in men over 40. It’s not a death sentence, but it is a signal that warrants a real clinical conversation. The PhenoAge research shows this band carries roughly double the all-cause mortality risk over a 10-year window compared to people whose bio age matches their chronological age. The good news: this is also where intervention produces the biggest absolute risk reduction. Bloodwork plus a clinician is the right next move.
What to do with this number
Three paths depending on what you found and where you want to go next.
Order the ApexBlood panel
Estimating with typical values is useful for orientation. Calculating with your real numbers is what makes this actionable. ApexBlood โ our sister lab focused on longevity and biomarker optimization โ covers all nine PhenoAge markers (including hs-CRP, which most basic panels don’t include) in a single comprehensive panel. Results in 3โ5 business days, then rerun this calculator with your own data.
All nine PhenoAge markers plus 50+ additional biomarkers across cardiovascular, metabolic, hormonal, liver, kidney, and inflammation categories. Free medical consultation included. The only panel built around the longevity question this calculator is asking.
TRT consultation
Testosterone influences multiple PhenoAge markers โ CRP (inflammation), glucose handling, body composition (which drives ALP and inflammation), and recovery (which affects WBC patterns). For men over 35 with elevated biological age, suboptimal testosterone is one of the more common underlying contributors. A consultation discusses whether the hormonal angle is worth pursuing for your specific picture.
- Telehealth-based โ no in-person visits required
- Licensed clinicians focused on men’s hormone optimization
- Ongoing monitoring throughout treatment
- Transparent pricing โ $97/month, no insurance gymnastics
Performance therapies
For men who are biologically younger than their chronological age and want to keep widening the gap, peptide therapies (sermorelin, others) support recovery, sleep depth, and inflammation control โ the variables that maintain a protective biological age profile into older age. Not a shortcut, but a useful tool when fundamentals are in order.
See Performance โFor most men, the sequence is: real labs first, then a clinical conversation. Running this calculator with typical values is a useful starting point โ but the highest-value move is replacing those values with your actual numbers.
Frequently asked questions
How accurate is the PhenoAge formula?
PhenoAge is among the most accurate biological age estimators that uses only standard blood tests. In the original Levine 2018 study, it outperformed chronological age for predicting all-cause mortality, cardiovascular events, cancer incidence, and physical function decline across more than 11,000 adults in NHANES III with up to 25 years of follow-up. Each year of “age acceleration” (PhenoAge above chronological age) was associated with roughly 9% higher all-cause mortality risk. More expensive aging clocks based on DNA methylation (Horvath, GrimAge) are somewhat more precise, but they require specialized testing. PhenoAge runs on a standard blood panel.
Why aren’t my testosterone levels in this calculator?
The PhenoAge formula was derived from a population dataset that included both sexes, and testosterone wasn’t among the variables that survived the statistical selection process for the most predictive composite score. That doesn’t mean testosterone is unimportant โ it absolutely affects long-term health โ it just wasn’t one of the nine markers needed for the most accurate composite. Testosterone influences several of the markers that are in PhenoAge (CRP, glucose, body composition effects on ALP and WBC), so its effects show up indirectly. A complete workup should include testosterone alongside the PhenoAge markers, which is why the ApexBlood panel covers both โ all nine PhenoAge inputs plus total testosterone and free testosterone in a single draw.
How quickly can biological age change?
Measurably within 6 to 12 months, sometimes faster. Inflammation (CRP) responds within weeks to changes in diet, sleep, and body composition. Glucose responds within 1 to 3 months. Red blood cell parameters (MCV, RDW) shift over 3 to 6 months as new cells replace older ones. Liver and kidney markers respond over 3 to 12 months. Several clinical studies have documented biological age reductions of 2 to 5 years over a 12-month period in adults who systematically addressed sleep, body composition, inflammation, and metabolic markers. The longer the intervention is sustained, the more durable the change.
Which marker matters most?
Mathematically, the highest-weighted variable in the PhenoAge formula is RDW (red cell distribution width), followed by glucose, MCV, and CRP. Practically, the markers most worth addressing in mid-life are the ones reflecting modifiable systems: CRP (inflammation, responsive to lifestyle), glucose (metabolic health, highly modifiable), and ALP (which reflects liver health and is affected by body composition and alcohol). RDW and MCV are harder to move but worth tracking โ when they shift, something meaningful is changing.
I’m worried my bio age is much higher than my chronological age. Is that a death sentence?
No. The PhenoAge research shows associations, not destinies. People with elevated biological age have higher statistical risk, but the relationship is highly modifiable โ multiple intervention studies have shown that meaningful improvement over 6 to 12 months is achievable for most adults. The number is most useful as a starting point and a tracking tool, not a verdict. If your number is concerning, the productive response is to get a complete workup, identify which specific markers are driving the gap, and address them. The same biology that produced the elevated number is the biology that responds to intervention.
Should I use this calculator if I have a known health condition?
PhenoAge was validated in a general population and assumes no acute illness at the time of testing. If you have an active infection, recent surgery, or an inflammatory condition that’s actively flaring, your CRP and WBC values will be elevated for reasons unrelated to long-term biological aging โ and the calculator will overestimate your bio age. For known chronic conditions (well-controlled hypertension, treated thyroid disease), the calculator still produces useful estimates but the result should be interpreted with a clinician. The number is most useful when you’re at baseline health, not when something acute is happening.
Does this calculator save my data?
No. Your inputs exist only in your browser session. Nothing is stored, logged, or attached to any account. You can run the calculator as many times as you want without anything being saved on our end.
Default values get you oriented. Your numbers get you a plan.
The estimate above is only as useful as the data going into it. Replace those typical values with your own results from an ApexBlood panel and you have something that’s actually actionable โ a real biological age, a clear list of which markers are driving it, and a roadmap of where to focus.
The PhenoAge calculator is for educational and self-tracking purposes only. It is not a diagnostic tool. Biological age is a population-level statistical construct โ individual values should be interpreted alongside other clinical information by a qualified clinician. PhenoAge was developed by Levine et al. and published in Aging in 2018 (PMID: 29676998). This implementation uses the published coefficients exactly.