Men's Health
What Are Normal Testosterone Levels by Age?
October 8, 2026 Vitality Medicine RX Editorial Team
For healthy young men, total testosterone typically falls in a reference range of roughly 264 to 916 ng/dL, and levels decline about 1 to 2 percent per year after age 30. A single number is not a diagnosis: testosterone is interpreted alongside symptoms, and low testosterone is confirmed with repeat early-morning testing. Vitality Medicine RX offers nurse practitioner-led telehealth hormone evaluation in states where Dr. Miklos Major II, Sc.D., DNP, NP-BC, FAAMFM holds an active license.
What is the normal range for total testosterone?
A harmonized reference range for total testosterone in healthy, nonobese men aged 19 to 39 is approximately 264 to 916 ng/dL, based on pooled United States and European cohort data. Individual laboratories use their own ranges, which can differ slightly, so the range printed on your lab report is the one your clinician uses to interpret your results.
How do testosterone levels change with age?
Testosterone peaks in the late teens and twenties, then declines gradually, roughly 1 to 2 percent per year after age 30. Free testosterone, the fraction not bound to proteins, tends to fall faster than total testosterone because a binding protein called SHBG rises with age. The decline is gradual, not a cliff, and symptoms are not an inevitable part of aging.
What counts as low testosterone?
The Endocrine Society defines the lower limit of normal total testosterone as about 264 ng/dL, and some guidelines use 300 ng/dL. But a low number alone is not a diagnosis: hypogonadism is diagnosed only when consistent symptoms are present together with consistently low levels, confirmed on at least two early-morning measurements.
Why symptoms matter more than a single number
Fatigue, low libido, low mood, poor sleep and weight changes overlap with thyroid, metabolic, sleep and stress conditions. A low number without symptoms, or symptoms with a normal number, both need context. That is why evaluation looks at the whole picture, not one lab value.
When to talk to a clinician
If you have symptoms that may relate to hormones and want to know where your levels stand, book a discovery call. We will confirm we can see you in your state and outline which labs may be appropriate.
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This article is educational and does not replace individualized medical advice. If you have questions about your own health, book a discovery call with Vitality Medicine RX. Your care is led by Dr. Miklos Major II, Sc.D., DNP, NP-BC, FAAMFM, a Doctor of Nursing Practice (DNP) and Doctor of Science (Sc.D.), board-certified nurse practitioner (NP-BC). Care is available in states where he holds an active license.
Book a Discovery CallQuestions About This Topic
What is a normal testosterone level for a 40-year-old man?
Most labs report a reference range of roughly 250 to 900 ng/dL for adult men. Levels vary by lab and time of day, which is why early-morning testing is standard.
At what testosterone level is treatment considered?
Guidelines commonly use a threshold around 264 to 300 ng/dL, but treatment is considered only when symptoms are present and low levels are confirmed on repeat testing after a full evaluation.
Do testosterone levels drop suddenly with age?
No. The decline is gradual, about 1 to 2 percent per year after 30, though free testosterone falls somewhat faster.
How do I get my testosterone tested?
Book a discovery call. Testing is ordered after an intake and completed near you or with a home kit where available, depending on your state.
Last updated 2026-10-08.