Normal Testosterone Levels by Age: The Complete 2026 Chart
T-Boost Team
Updated August 2026
Normal total testosterone ranges from roughly 300–1,000 ng/dL in men in their 20s down to 160–650 ng/dL by the 70s and beyond, declining gradually with age rather than dropping at any single cutoff. The full age-by-age chart is below, followed by how to read your own result.
Testosterone Levels by Age (2026 Chart)
Age range | Total testosterone (ng/dL) | Total testosterone (nmol/L) |
|---|---|---|
18–29 | 300–1,000 | 10.4–34.7 |
30–39 | 280–900 | 9.7–31.2 |
40–49 | 250–850 | 8.7–29.5 |
50–59 | 215–780 | 7.5–27.1 |
60–69 | 195–720 | 6.8–25.0 |
70–90 | 160–650 | 5.5–22.5 |
Ranges above come from a 2017 harmonization study that pooled data across four major cohort studies in the US and Europe to standardize testosterone reference ranges across labs¹ — one of the more rigorous sources available for what’s typical.
→ Check Your Exact Range on the Calculator
ng/dL vs nmol/L — Which Unit Are You Looking At?
US labs almost always report in ng/dL (nanograms per deciliter). Most of Europe, Canada, and Australia report in nmol/L (nanomoles per liter). To convert, multiply ng/dL by 0.0347 to get nmol/L, or multiply nmol/L by 28.85 to get ng/dL.
What Counts as Low vs. Just Age-Related Decline
Being in the lower half of your age range isn’t the same as clinical hypogonadism. The Endocrine Society’s practice guideline generally defines low testosterone as total testosterone below roughly 300 ng/dL, confirmed on at least two separate morning blood draws, combined with symptoms².
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Why Your Number Can Vary by Lab and Time of Day
Testosterone peaks in the early morning and declines through the day — guidelines specifically recommend fasting morning draws, typically before 10am, for an accurate reading. Different lab assay methods can also produce slightly different numbers for the same blood sample.
Frequently Asked Questions
What is a normal testosterone level for my age?
Check the chart above for your age bracket — normal ranges shrink as you age, so a number that’s low at 30 can be entirely typical at 65.
Can I check where I fall without a blood test?
You can see the typical range for your age instantly with our calculator, and track the lifestyle factors — sleep, training, food — that influence where you land within that range day to day. Only a blood draw gives an exact number.
How to See Where You Actually Fall
A blood draw is the only way to get an exact number. But your day-to-day habits — sleep, training, body composition, and especially what you eat — are the levers most directly tied to where you land within your age-based range over time.
T-Boost Scan tracks those levers day to day: scan a meal or supplement to see its estimated impact, follow a daily protocol, and watch your lifestyle-based T-Score move as your habits change.
References
1. Travison TG, et al. Harmonized Reference Ranges for Circulating Testosterone Levels in Men of Four Cohort Studies in the United States and Europe. J Clin Endocrinol Metab. 2017;102(4):1161–1173.
2. Bhasin S, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103(5):1715–1744.
