Short answer: there is no single “normal” free testosterone number for your age. The reference range printed on your own lab report is the benchmark for your sample. Age matters, since free testosterone generally trends down across adult decades, but age figures from a website cannot replace the range on your report.
This guide walks through how to read that report, what the research we could verify does and does not say about free testosterone by age, and what to bring to a clinician. It is educational and is not medical advice.
What “Free Testosterone” Means on a Lab Report
Free testosterone is the portion of testosterone in your blood that is not bound to carrier proteins such as sex hormone-binding globulin (SHBG). Our companion piece on free versus total testosterone and the HPG axis covers the physiology. Here the focus is reading the number.
Check whether your report lists free testosterone as a measured or a calculated value. A calculated value is an estimate from other results. In the study below, for example, it was derived from total testosterone, SHBG, and albumin. If your report does not say which method was used, that is a good question for the lab or your clinician.
What the Research Shows About Free Testosterone by Age
The clearest recent dataset we could verify is a 2024 conference abstract presented at the American Urological Association annual meeting. Using U.S. NHANES data from 2013 to 2016 (1,147 men), the authors calculated free testosterone from total testosterone, SHBG, and albumin, after excluding men with a BMI over 30, certain medical conditions, or hormonal medications. They reported:
- Average calculated free testosterone of about 114.3 pg/mL in men in their 20s, the highest of any decade.
- Average of about 45.8 pg/mL in men 80 and older.
- A decline of roughly 12.7% per decade overall, with the steepest drop (about 16.9%) between the 20s and 30s.
- Substantial individual variation within every age group.
Two limits matter. These are group averages from one calculation method in a screened, non-obese sample, not diagnostic cutoffs. And this is a conference abstract, so it should be read as preliminary. No single source gives a range that every lab will match.
Why Your Lab’s Range May Not Match What You See Online
- Units. Free testosterone may be reported in pg/mL or ng/dL. For reference, 1 ng/dL equals 10 pg/mL, so 114.3 pg/mL is the same as about 11.4 ng/dL.
- Measured versus calculated. A calculated value depends on the SHBG and albumin results and on the formula used.
- Population and method. Published averages come from specific groups and specific methods, such as the screened NHANES sample above, and your lab’s range may be built differently.
- Assay quality. The Endocrine Society’s presentation of its testosterone guideline recommends an accurate and reliable testosterone assay, ideally certified by an accuracy-based standardization or quality-control program. It is worth knowing who ran your test.
The same Endocrine Society presentation describes diagnostic blood draws in the early morning on two different days after fasting, and notes a greater emphasis on free testosterone than in the prior guideline. It also cites a harmonized reference range for total testosterone of roughly 264 to 916 ng/dL, which is a different measurement from free testosterone. Source: Endocrine Society, Testosterone Therapy in Men With Hypogonadism (2018 guideline presentation).
Lab-Report Reading Worksheet
Part 1: Age Context (Averages, Not Cutoffs)
Only the values below are supported by the source above. Other decades are left for you to fill in from your own report, because ranges vary by lab and assay method.
- Your 20s: average calculated free testosterone of about 114.3 pg/mL in the AUA NHANES abstract (varies by lab and assay method).
- Your 30s through 70s: the abstract reports an average decline of about 12.7% per decade but gives no band to treat as a target. Write the range printed on your own report here.
- 80 and older: average of about 45.8 pg/mL in the same abstract (varies by lab and assay method).
Part 2: Steps to Compare Your Result With Your Lab’s Own Range
- Find the free testosterone line and write down your value and its unit.
- Find the reference range printed on that same line and confirm it uses the same unit. Convert only if the units differ.
- Note whether the result is measured or calculated, and which method the lab lists.
- Note whether the range is age-specific or one general adult range.
- Find the total testosterone and SHBG results on the same report and write them next to your free value.
- Note the draw date and time. Testosterone is usually checked in the early morning.
- Note whether the lab flags the value as high, low, or within range, and how close it sits to either edge.
- Keep the full report so a repeat test can be compared at the same lab with the same method.
Part 3: Questions to Bring to a Clinician
- Are my symptoms, if any, a reason to test, and are other conditions worth checking?
- Was my blood drawn at the right time of day, and was I fasting if that was required?
- Should this be repeated, and on what schedule?
- Is my free testosterone measured or calculated, and is that the best method for me?
- How do my SHBG and total testosterone fit with this number?
- Could sleep, illness, weight changes, medications, or supplements have affected this result?
- Which lab should I use for repeat testing so the numbers stay comparable?
Limits and When to Seek Professional Advice
A single free testosterone value cannot diagnose a condition. Results change with the time of day, recent illness, sleep, body weight, and the method used. Do not start, stop, or change any medication or supplement based on a lab number without talking to a licensed clinician. Seek medical advice promptly if you have persistent symptoms that worry you, a result flagged well outside your lab’s range, or you are taking medications that affect hormones.
Next Steps
Pull your most recent lab report, complete the worksheet above, and write down your questions before your appointment. If you want the physiology behind free versus total testosterone and SHBG first, start with our overview of the HPG axis, free versus total testosterone, and lifestyle factors.
Sources
- Dokter J, Zwaans B, Beano H. Age Specific Calculated Free Testosterone Ranges in Adult Men. Journal of Urology, AUA Annual Meeting abstract, 2024. Checked October 3, 2026. Corewell Health Scholarly Works.
- Endocrine Society. Testosterone Therapy in Men With Hypogonadism (2018 guideline presentation, PDF). Checked October 3, 2026. Endocrine Society PDF.
Educational content from PerformixHouse.com. It is not medical advice and does not replace evaluation by a licensed clinician.
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