Normal testosterone in adult men generally falls between 264 and 916 ng/dL, but the range shifts meaningfully depending on your age, sex, and how the test is done. A 25-year-old man and a 70-year-old man can both have “normal” results that look very different from each other. Here’s what the numbers actually look like across the lifespan.
Normal Testosterone in Adult Men
A landmark standardization effort by the CDC and Endocrine Society established the harmonized reference range for healthy, non-obese men aged 19 to 39: 264 to 916 ng/dL. That range serves as the primary benchmark most labs use, but the floor and ceiling both drop as men get older.
Here’s how total testosterone ranges shift by decade in men:
- Age 40 to 49: 252 to 916 ng/dL
- Age 50 to 59: 215 to 878 ng/dL
- Age 60 to 69: 196 to 859 ng/dL
- Age 70 to 79: 156 to 819 ng/dL
These are broad population ranges, meaning they capture the 5th to 95th percentile. A 72-year-old man at 300 ng/dL is statistically normal even though that same number would sit near the low end for a 30-year-old. The Endocrine Society diagnoses low testosterone (hypogonadism) only when levels are consistently and unequivocally low on repeated testing, combined with actual symptoms like fatigue, low libido, or loss of muscle mass. A single blood draw that looks borderline isn’t enough.
How Testosterone Declines With Age
Testosterone peaks in the late teens to early twenties, then begins a slow, steady decline. After age 40, levels drop roughly 1% per year on average. That pace is gradual enough that most men never notice symptoms, but it means a man in his 70s may have total testosterone 30 to 40% lower than his peak. The decline in free testosterone, the fraction your body can actually use, is steeper because a protein called sex hormone-binding globulin increases with age, locking up more of the circulating hormone.
Free Testosterone Ranges by Age
Total testosterone is the number most labs report first, but free testosterone tells you how much is available to your tissues. Only about 2 to 3% of testosterone floats unbound in the bloodstream. The rest is attached to proteins. Free testosterone ranges for men, measured in ng/dL, look like this:
- Age 20 to 24: 5.25 to 20.7 ng/dL
- Age 25 to 29: 5.05 to 19.8 ng/dL
- Age 30 to 34: 4.85 to 19.0 ng/dL
- Age 35 to 39: 4.65 to 18.1 ng/dL
- Age 40 to 44: 4.46 to 17.1 ng/dL
- Age 45 to 49: 4.26 to 16.4 ng/dL
- Age 50 to 54: 4.06 to 15.6 ng/dL
- Age 55 to 59: 3.87 to 14.7 ng/dL
- Age 60 to 64: 3.67 to 13.9 ng/dL
- Age 65 to 69: 3.47 to 13.0 ng/dL
- Age 70 to 74: 3.28 to 12.2 ng/dL
- Age 75 to 79: 3.08 to 11.3 ng/dL
- Age 80 to 84: 2.88 to 10.5 ng/dL
If your total testosterone looks normal but you still have symptoms, a low free testosterone result can explain the mismatch. Some clinicians consider free testosterone the more useful measurement, especially in older men or those carrying extra body fat.
Normal Testosterone in Women
Women produce far less testosterone than men, but it still plays a key role in energy, bone density, and sex drive. The general reference range for adult women is 15 to 70 ng/dL. Free testosterone in women runs below 1.08 ng/dL in the twenties and gradually decreases with age, dropping below about 0.68 ng/dL by the nineties.
Menopause is one of the most common causes of declining testosterone in women. Levels can fall noticeably in the years surrounding it, which sometimes contributes to low energy and reduced libido alongside the more well-known effects of falling estrogen. On the other hand, testosterone that’s too high in women can signal conditions like polycystic ovary syndrome, which often shows up with irregular periods, acne, or excess hair growth.
Testosterone During Puberty
Before puberty, testosterone levels in boys and girls are nearly identical, sitting around 2 to 17 ng/dL. Once puberty begins, male levels surge dramatically. Data from the University of Iowa Health Care breaks this down by developmental stage:
- Boys, early puberty (Tanner stage II): 3 to 303 ng/dL
- Boys, mid puberty (Tanner stage III): 10 to 851 ng/dL
- Boys, late puberty (Tanner stage IV to V): 162 to 847 ng/dL
Girls see a much smaller increase. Their levels rise from about 2 to 17 ng/dL before puberty to roughly 5 to 63 ng/dL at later stages, then stay within that general band through adulthood. The enormous variability in boys during mid-puberty reflects how differently individuals mature. Two 13-year-olds can both be perfectly healthy with testosterone levels that differ by a factor of ten.
Why Testing Time Matters
Testosterone follows a strong daily rhythm. Levels are highest in the early morning and drop significantly by evening. In one densely sampled study, testosterone fell approximately 63% from morning to evening in a healthy male subject. That’s not a subtle fluctuation; it’s the difference between a normal result and one that looks clinically low.
This is why guidelines call for blood draws between 7 and 10 a.m. An afternoon test can return a misleadingly low number, potentially leading to an unnecessary diagnosis. If your result was drawn later in the day and came back borderline, a repeat morning test is worth requesting.
Body Fat and Testosterone
Excess body fat is one of the strongest modifiable factors pulling testosterone down. Research using NHANES data found that for every 1% increase in total body fat percentage, testosterone dropped by about 12 ng/dL in men. That adds up fast: a man carrying 10% more body fat than his leaner counterpart could have testosterone roughly 120 ng/dL lower, which is enough to push someone from mid-range to borderline low.
The relationship runs both directions. Low testosterone promotes fat storage, especially around the midsection, and more fat tissue further suppresses testosterone through increased conversion of testosterone into estrogen. This feedback loop means that weight loss can meaningfully raise testosterone levels without any medical intervention. Studies consistently show that men who lose significant body fat see their testosterone climb, sometimes back into normal range entirely. Sleep, alcohol intake, and chronic stress also influence levels, but body composition is the single biggest lever most men can pull.
What the Numbers Mean in Practice
Reference ranges are population averages, not personal targets. A man at 350 ng/dL with no symptoms is in a fundamentally different situation from a man at 350 ng/dL who can barely get through the afternoon. Context shapes interpretation: your age, body composition, symptoms, and whether the blood was drawn under proper conditions all matter more than where a single number lands on a chart.
If you’re comparing your results to the ranges above, keep in mind that different labs use different assays, and their printed reference ranges may not be identical to these. The numbers on your lab report will include that specific lab’s normal range. What’s consistent across all reliable sources is the overall pattern: testosterone peaks in early adulthood, declines gradually with age, and is affected significantly by body fat, sleep, and the time of day your blood was drawn.