What Is a Normal Testosterone Level by Age?
Medically reviewed by Evan Fox, NP
Last updated August 2026
Most men land on this page for one reason. They got a lab result back, saw a number, and now they are trying to work out whether that number explains how they have been feeling.
That instinct is right. Testosterone is worth understanding. But a single number on a lab report is one of the least useful things you can look at in isolation, and a lot of men walk away from a five-minute appointment being told they are “in range” while still dealing with fatigue, stalled progress in the gym, low drive, and a foggy head that will not clear.
Here is the problem. Reference ranges are built from population averages, which include men who are unwell, sedentary, sleep-deprived, and decades older than you. Falling inside that range means you are not unusual compared to everyone else who got tested. It does not mean your hormones are working well for your body.
This guide walks through what testosterone actually does, what the age-based ranges look like, why free testosterone often tells a truer story than total testosterone, and when a number combined with symptoms is worth acting on.
Quick Answer
In most labs, normal total testosterone in adult men falls somewhere between roughly 300 and 1,000 ng/dL. Levels generally peak in a man’s late teens and twenties, then decline gradually by around 1 percent per year after about age 30.
But two things matter more than the range itself:
- Free testosterone, the small fraction that is actually available to your tissues, can be low even when total testosterone looks acceptable.
- Symptoms. A man at 400 ng/dL with clear symptoms of deficiency may need treatment. A man at 400 ng/dL who feels excellent may not.
A proper evaluation looks at total testosterone, free testosterone, SHBG, LH, FSH, and your actual symptoms together. That is the only way to know whether your level is a problem for you.
This page is educational and is not a diagnosis. Only a licensed provider reviewing your labs and history can tell you where you stand.
What Testosterone Does in the Male Body
Testosterone is the primary male sex hormone. It is produced mostly in the testes, and production is controlled by a feedback loop running between the hypothalamus, the pituitary gland, and the testes.
Its job description is broader than most men realize. Testosterone influences:
- Muscle mass and strength. It drives protein synthesis, which is why men with low levels often train hard and see very little return.
- Body fat distribution. Low testosterone tends to show up as stubborn abdominal fat that resists diet changes.
- Bone density. Testosterone helps maintain skeletal strength throughout adult life.
- Red blood cell production. It stimulates the bone marrow, which is relevant later when we discuss monitoring.
- Libido and erectile function. Desire and performance are both hormone sensitive.
- Mood, motivation, and cognition. Drive, focus, and emotional steadiness all have a hormonal component.
- Sleep quality. The relationship runs both directions. Poor sleep lowers testosterone, and low testosterone worsens sleep.
When levels drop meaningfully, men rarely notice one isolated symptom. They notice that several things have quietly gotten harder at once.
Normal Testosterone Levels by Age
The table below reflects typical total testosterone ranges seen across age groups. Lab reference ranges vary by facility and assay method, so always compare your result to the range printed on your own report.
| Age Range | Typical Total Testosterone (ng/dL) |
What This Stage Usually Looks Like |
|---|---|---|
| 20 to 29 | Approx. 400 to 1,080 | Peak lifetime production for most men |
| 30 to 39 | Approx. 350 to 1,000 | Gradual decline begins, often unnoticed |
| 40 to 49 | Approx. 300 to 950 | Symptoms commonly start surfacing here |
| 50 to 59 | Approx. 280 to 900 | Decline compounds with body composition changes |
| 60 to 69 | Approx. 250 to 850 | Deficiency becomes more clinically common |
| 70 and above | Approx. 200 to 800 | Wide individual variation |
How to read this table properly. These are observed population ranges, not treatment targets and not a scoring system. A 45 year old at 310 ng/dL is technically inside the range for his age group. He may also feel terrible, and that matters.
The average testosterone level of American men has also declined across generations, independent of age. A man today frequently tests lower than a man of the same age tested decades ago. That means “normal for your age right now” is a moving target, and a low bar.
Total Testosterone vs Free Testosterone
This distinction is the single most important thing on this page.
Total testosterone measures every molecule of testosterone circulating in your blood. Most of it is not doing anything useful, because it is bound to carrier proteins.
Roughly speaking:
- 40 to 60 percent is bound tightly to SHBG (sex hormone binding globulin). This portion is essentially locked away and unavailable to your tissues.
- Most of the remainder is loosely bound to albumin. This is weakly held and largely usable.
- Only about 1 to 3 percent circulates completely unbound. This is your free testosterone, and it is the fraction that can enter cells and produce an effect.
Bioavailable testosterone refers to free testosterone plus the albumin-bound portion, which together represent what your body can actually access.
Why this matters practically: a man with high SHBG can have a total testosterone of 600 ng/dL, which looks perfectly healthy on paper, while his free testosterone sits well below optimal. He has plenty of testosterone. He just cannot use much of it. He will have symptoms, and a total-only panel will completely miss the reason.
This is why a testosterone evaluation that measures total testosterone alone is not a real evaluation. If SHBG is not on your panel, you are missing a variable that changes the interpretation of everything else.
Learn more in our full guide: What Is SHBG and Why Does It Matter for Testosterone?
Why “Normal” Doesn’t Always Mean Optimal
Reference ranges are statistical, not clinical. They are typically built to capture the middle 95 percent of a sampled male population. That sample includes men who are obese, diabetic, poorly slept, heavily stressed, and much older than you.
So when a lab flags your result as normal, what it is telling you is that you resemble a broad group of other men who got blood drawn. It is not telling you that your hormones are supporting your health, your training, your mood, or your relationship.
Three practical consequences:
A number near the bottom of the range is still near the bottom. A result of 320 ng/dL prints without a flag. Functionally, that man is often struggling.
Your personal baseline is invisible on a lab report. If you naturally ran at 800 ng/dL in your twenties and now sit at 380, you have lost more than half your production. The lab has no way to know that. You do.
Symptoms are data. Clinical guidelines are clear that low testosterone is diagnosed by biochemical evidence combined with consistent signs and symptoms. Neither one alone is sufficient. A number without symptoms usually means watchful waiting. Symptoms without a low number means the workup is not finished yet.
The right question is not “am I in range.” It is “is my current hormonal picture explaining how I feel, and is it correctable.”
Signs Your Testosterone May Be Too Low
Symptoms of low testosterone cluster into groups. Men usually notice several at once rather than one in isolation.
Physical
- Persistent fatigue that sleep does not resolve
- Loss of muscle mass despite consistent training
- Increased body fat, particularly around the midsection
- Longer recovery time and more soreness after workouts
- Reduced strength and work capacity
Sexual
- Reduced libido or interest in sex
- Erectile difficulty or softer erections
- Fewer spontaneous morning erections
Mental and emotional
- Brain fog and difficulty concentrating
- Loss of motivation and drive
- Irritability or a shorter fuse than usual
- Low mood, anxiety, or reduced confidence
Other
- Poor or unrefreshing sleep
- Reduced body or facial hair growth
- Lower bone density over time
None of these symptoms are exclusive to low testosterone. Thyroid dysfunction, sleep apnea, depression, anemia, and medication side effects can all produce a similar picture, which is exactly why a real evaluation looks beyond a single hormone.
See the full breakdown: Low Testosterone Symptoms in Men: Complete Checklist
What Causes Testosterone Levels to Decline
Testosterone decline is not purely a function of birthdays. Several drivers are modifiable.
Age. Production declines gradually from around age 30, commonly cited at roughly 1 percent per year. This alone rarely explains a dramatic drop in a younger man.
Body composition. Excess body fat, especially visceral fat, increases aromatase activity, which converts testosterone into estradiol. Higher body fat tends to mean lower testosterone, and lower testosterone makes fat loss harder. It is a genuine feedback loop.
Sleep debt. A large share of daily testosterone release happens during sleep. Chronic short sleep and untreated sleep apnea both suppress production significantly.
Chronic stress. Sustained elevated cortisol suppresses the hypothalamic-pituitary signal that tells the testes to produce testosterone.
Metabolic conditions. Type 2 diabetes, insulin resistance, and metabolic syndrome are strongly associated with lower testosterone.
Medications. Opioids, long-term glucocorticoids, some antidepressants, and certain other drugs can suppress levels.
Alcohol. Heavy or sustained intake affects both the testes and the liver, which alters hormone handling.
Primary testicular issues. Injury, infection, undescended testes, varicocele, chemotherapy, or radiation can impair production directly.
Pituitary or hypothalamic problems. If the signal from the brain is impaired, the testes never receive the instruction to produce. LH and FSH levels help distinguish this from a testicular cause.
Prior anabolic steroid use. Exogenous androgens suppress natural production, sometimes for a long stretch after stopping.
The practical point is that the cause changes the treatment. A 32 year old with sleep apnea and a suppressed pituitary signal needs a different conversation than a 58 year old with primary testicular decline.
How Testosterone Should Be Tested
Testing done casually produces results that are close to meaningless. If you want an answer you can act on, the process matters.
Test in the morning. Testosterone follows a daily rhythm and peaks in the early hours. Draws between 7:00 and 10:00 AM are standard. An afternoon draw can read substantially lower and cause a false impression of deficiency.
Test more than once. Levels fluctuate day to day. Clinical guidance calls for at least two separate morning measurements before diagnosing deficiency. One low reading is a signal, not a conclusion.
Test fasted where possible. Food intake, particularly glucose, can transiently lower testosterone readings.
Avoid testing during acute illness. Being sick, injured, or under severe short-term stress suppresses levels and produces a result that is not representative.
Measure more than total testosterone. A useful panel includes:
- Total testosterone
- Free testosterone
- SHBG
- LH and FSH, which show whether the signal from the brain is intact
- Prolactin
- Complete blood count, including hematocrit
- Comprehensive metabolic panel
- PSA, where age appropriate
At Men’s Health Co., our Elite Hormone Panel was built specifically so that men get the full picture in one draw rather than being told “your testosterone is fine” on the strength of a single number. The panel is designed to show what your level is, why it is where it is, and what can be corrected.
When Low Testosterone Becomes a Medical Issue
Low testosterone crosses from a number into a diagnosis when two conditions are met together:
consistently low measurements on properly collected morning labs, and symptoms that match.
This condition is formally called hypogonadism, and it has two broad forms:
Primary hypogonadism means the testes are not producing adequately despite receiving a normal or elevated signal. LH and FSH are typically high, because the brain is calling louder and getting no response.
Secondary hypogonadism means the signal itself is inadequate. LH and FSH are low or inappropriately normal alongside low testosterone. Causes include pituitary issues, obesity, sleep apnea, chronic stress, opioid use, and prior anabolic steroid use. This form is frequently the more correctable of the two, and it is also the form where treatments that restart your own production, rather than replace it, may be appropriate.
Why it is worth taking seriously. Untreated deficiency is associated with reduced bone density and increased fracture risk, increased cardiovascular risk, early cognitive decline, unfavorable changes in body composition, worsening insulin sensitivity, and a measurable impact on mood and quality of life. This is not only a lifestyle inconvenience.
Why treatment should be supervised. TRT is a long-term medical therapy with real considerations. It suppresses natural production and sperm output. It requires ongoing monitoring of hematocrit, testosterone, and PSA, just to name a few. It is not appropriate for men with certain conditions, and it should not be started by anyone who is not going to follow up afterward.
That is the standard of care we hold at Men’s Health Co. Nevada-licensed, provider-led, monitored, and adjusted based on your labs rather than a template.
Frequently Asked Questions
What is a normal testosterone level for a 40 year old man?
Most labs report a range of roughly 300 to 950 ng/dL for men in their forties. Where you sit within that range matters more than whether you are inside it, and free testosterone and symptoms should be assessed alongside the total number.
Is 300 ng/dL low testosterone?
A result of 300 ng/dL sits at the very bottom edge of most reference ranges. Many men at that level have clear symptoms of deficiency. Whether it warrants treatment depends on repeat morning testing, free testosterone, SHBG, and your symptom picture.
What is a good free testosterone level?
Free testosterone reference ranges vary substantially by lab and assay, commonly falling around 20 to 35 ng/dL, or roughly 1 to 3 percent of total testosterone. Compare your result against your own lab’s stated range, and interpret it alongside SHBG.
You can calculate your free testosterone here
Can I have low testosterone with normal total testosterone?
Yes, and this is common. Elevated SHBG binds testosterone tightly and reduces the free, usable fraction. Total testosterone can look healthy while free testosterone is low enough to cause symptoms.
What time of day should I get my testosterone tested?
Between 7:00 and 10:00 AM. Testosterone peaks in the morning and declines through the day, so an afternoon draw can significantly understate your true level.
Does testosterone decline every year after 30?
On average, yes, at roughly 1 percent per year. That average hides enormous individual variation. Sleep, body composition, stress, alcohol, and underlying medical conditions can accelerate the decline considerably.
Can I raise my testosterone naturally?
For many men, meaningful gains are possible through resistance training, fat loss, consistent sleep of seven to nine hours, reduced alcohol intake, stress management, and correcting deficiencies such as vitamin D. These steps should be the first line for most men. They are less likely to be sufficient when there is a genuine underlying testicular or pituitary problem.
How many times do I need to be tested before starting treatment?
At least two separate morning measurements are standard before a diagnosis is made, along with supporting labs to identify the underlying cause.
Do testosterone levels vary between labs?
Yes. Different assay methods and reference populations produce different ranges. Where possible, track your results at the same lab over time so you are comparing like with like.
Is high testosterone a problem too?
Naturally elevated testosterone is uncommon and warrants investigation. Levels driven above the physiologic range by unsupervised use of testosterone or anabolic agents carry real risks, including elevated hematocrit, cardiovascular strain, and suppression of natural production.
Will insurance cover testosterone testing?
Coverage varies by plan and by the reason for testing. Our onboarding call covers cost and process clearly before anything is ordered, so there are no surprises.
What happens if my levels are normal but I still feel awful?
That is a common and legitimate situation, and it is a reason to look further rather than stop. Thyroid dysfunction, sleep apnea, iron deficiency, high SHBG, depression, and medication effects all produce overlapping symptoms. A comprehensive panel is designed to find the actual cause.
Ready to Find Out Where You Actually Stand?
You do not have to guess, and you should not have to settle for “you’re in range.”
Men’s Health Co. is a Nevada-licensed men’s hormone practice based in Reno, serving men across the state through secure telehealth. Every evaluation starts with our Elite Hormone Panel and a real conversation with a provider about what your results mean.
Here is how it works:
Book a 15 minute onboarding call
We email you a lab slip for a lab near you
You get your blood drawn
We schedule a full one hour consultation to review your results, discuss risks and benefits, and start treatment if you qualify
Call (775) 540-2100 | Reno, NV | Statewide telehealth