What is a normal testosterone level for an adult man?
For healthy adult men, the reference most clinicians now use is about 264 to 916 ng/dL. That range comes from a 2017 harmonization study that put testosterone results from four large cohorts in the United States and Europe on a common, standardized scale, then took the 2.5th to 97.5th percentiles for healthy, non-obese men aged 19 to 39.
The Endocrine Society guideline adopted that range, with 264 ng/dL as the lower limit of normal. The American Urological Association uses 300 ng/dL as its cutoff. Your own lab may print a different range, because assays and reference groups vary, so always compare your result with the range on your report.
What does the research show by age?
Testosterone does drift down with age, though less sharply than many charts suggest. The same harmonization study modeled population percentiles by decade for non-obese men:
| Age | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| 19 to 39 | 304 | 531 | 850 |
| 40 to 49 | 273 | 481 | 839 |
| 50 to 59 | 256 | 477 | 839 |
| 60 to 69 | 254 | 477 | 839 |
| 70 to 79 | 252 | 477 | 839 |
Values are model-based estimates in ng/dL from Travison and colleagues (2017), Table 4.
The median dips between the 30s and the 40s and then barely moves through the 70s. Following the same men over time shows a steeper personal decline. In the Massachusetts Male Aging Study, total testosterone fell about 1.6% a year within individual men, and bioavailable testosterone fell about 2 to 3% a year. The authors suggested that new health problems may speed the age-related decline.
Why are online age charts not diagnostic cutoffs?
The age charts that circulate online are not diagnostic cutoffs, for four reasons.
- They describe populations, not disease. A percentile tells you where a number falls among men your age. It does not tell you whether that number is causing symptoms.
- Many have no clear source. Charts are often copied without the lab method, the population, or whether the men were healthy or obese, and each of those moves the numbers.
- Guidelines anchor to young adults. The Endocrine Society’s lower limit comes from men aged 19 to 39, and its diagnosis rests on symptoms plus two low morning results rather than an age-specific cutoff.
- Units and timing differ. A chart in nmol/L, or one built from afternoon draws, cannot be compared fairly with a fasting morning result in ng/dL.
So a 62-year-old at 300 ng/dL is not automatically “normal for his age,” and a 35-year-old at 450 ng/dL is not “low for his age” because a chart says the average man his age has more. Both need the same evaluation: repeat morning tests, symptoms and, where relevant, free testosterone. Our page on whether 350 is low testosterone works through a common borderline case.
What moves testosterone more than age?
Health and habits often move testosterone more than birthdays do. In the Massachusetts study, men in apparent good health, meaning no chronic illness, regular medication, obesity or excessive drinking, had levels of several androgens 10 to 15% higher than other men.
Common reasons a result comes back lower than expected:
- Excess body fat and type 2 diabetes
- Short or poor sleep, including untreated sleep apnea
- Opioid pain medicines and some other drugs (see medications that lower testosterone)
- A recent illness or surgery
- Heavy drinking
Age also raises SHBG, the protein that binds testosterone, which is one reason free testosterone falls faster than the total in older men.
How can you compare your own result fairly?
Start with how the blood was drawn. MedlinePlus notes that samples are usually taken between 7 and 10 a.m., when levels are highest, and a fasting morning draw is what guidelines expect. Then check the units: 264 ng/dL equals 9.2 nmol/L. Compare your number with the range your lab printed, not with a chart from the internet.
If the result is low or borderline, repeat it before drawing conclusions. Our page on the total testosterone blood test explains how to set up a clean draw, and the page on repeat testosterone testing explains why one number is never enough.
How Ultimate Male reads a number in context
When you bring a result to our San Gabriel or Downey clinic, your provider reads it against the lab’s method and range, your symptoms, your weight and medicines, and whether it was a morning draw. Your birth year is not the deciding factor. If the number needs repeating, that happens on site as part of the TRT pre-screening panel.
Age matters in one practical way: it changes the safety checks, such as PSA, that come with testosterone therapy. Our page on what age men start TRT covers that side. The free 10-minute call is a simple way to ask whether your number deserves a second look.
