What Are Normal Testosterone Levels By Age in Men?

Testosterone levels usually peak during adolescence and early adulthood. Starting around age 30 to 40, the average level gradually declines, often by about 1 percent per year.

That does not mean every man experiences the same decline or needs the same testosterone level. Normal is a range, not one perfect number.

Your age matters, but so do your symptoms, sleep, body composition, medications, health conditions, activity level, and the time of day your blood was drawn. A result that looks acceptable on paper may still deserve a closer look when it appears alongside persistent symptoms.

This guide explains normal testosterone levels by age, the difference between total and free testosterone, what low and high results may mean, and when further evaluation may be appropriate.

The goal is not to chase the highest possible number. It is to understand what your results mean within the full context of your health.

Why Testosterone Matters at Every Age

Testosterone is the primary androgen in men. It affects the development of the sexual organs, libido, production of sperm, muscle size, bone density, fat distribution, the production of red blood cells, mood and mental performance.

But its practical importance may change over the course of one's life.

In the 20s and 30s, testosterone plays a role in fertility, sexual function, muscle development, and recovery from exercise.

During the 40s and 50s, changes might be evident as less energy, a diminished drive, fatigue, loss of libido, or a shift in body weight.

In 60s and later, a healthy balance of hormones is one of the crucial factors for maintaining muscle mass, bone strength, sexual health and independence for the activities of daily living .

It’s important to note that reduced testosterone does not necessarily constitute a medical condition. Many men continue to have healthy levels as they age and some men with low levels do not have symptoms. The clinical question is whether there is a consistent hormone deficiency contributing to meaningful changes in how you feel or function.

Normal Testosterone Levels By Age

The amount of testosterone is typically reported in units called nanograms per deciliter (ng/dL).

One frequently cited reference range for healthy, non-obese men between ages 19 and 39 is 264 to 916 ng/dL. This range came from a study that harmonized testosterone measurements across several large U.S. and European cohorts.

It is not a universal reference range for every adult man. Laboratories use different testing methods and may provide different normal ranges. Age, weight, illness, medications, and other factors can also affect the result.

Testosterone Levels Chart

The following testosterone levels by age in men are broad population estimates. They can help readers understand the general pattern of age-related decline, but they should not be used as stand-alone diagnostic cutoffs.

• Ages 20 to 29: approximately 300 to 1,050 ng/dL
• Ages 30 to 39: approximately 280 to 900 ng/dL
• Ages 40 to 49: approximately 260 to 850 ng/dL
• Ages 50 to 59: approximately 240 to 800 ng/dL
• Ages 60 to 69: approximately 210 to 750 ng/dL
• Ages 70 and older: approximately 190 to 700 ng/dL

Younger men are more likely to fall toward the upper end of the population range. Testosterone generally declines with age, although the rate and timing vary considerably.

The average testosterone level for a man is also influenced by body mass index, physical activity, medical conditions, sleep, and SHBG levels. This is why the right number for you cannot be determined from age alone.

So, what is a healthy testosterone level?

It is a level that is accurately measured, interpreted using the appropriate laboratory range, and considered alongside symptoms, health history, and other relevant test results.

Source: Travison et al., 2017. PubMed PMID 28324103.

Free Testosterone vs Total Testosterone

Total testosterone measures nearly all the testosterone circulating in your bloodstream.

Most testosterone is attached to proteins, primarily sex hormone-binding globulin, known as SHBG, and albumin. Only a small percentage circulates as free testosterone.

Free testosterone is the portion that is not bound to these proteins. It is often described as the testosterone that is most readily available for the body to use.

Approximate Free Testosterone Levels by Age

Free testosterone levels by age may fall within these broad educational ranges:

• Ages 20 to 29: approximately 9 to 30 ng/dL
• Ages 30 to 39: approximately 8 to 28 ng/dL
• Ages 40 to 49: approximately 5.3 to 26.3 ng/dL
• Ages 50 to 59: approximately 4.2 to 22.2 ng/dL
• Ages 60 to 69: approximately 3.7 to 18.9 ng/dL
• Ages 70 and older: approximately 2.2 to 14.7 ng/dL

Free testosterone testing is less standardized than total testosterone testing. Laboratories may use different methods and report results in ng/dL, pg/mL, or other units. Always compare your result with the reference range and unit shown on your own laboratory report.

SHBG can significantly affect how total testosterone should be interpreted.

When SHBG is high, total testosterone may appear normal even though the free portion is relatively low. When SHBG is low, total testosterone may appear low while free testosterone remains within range.

Age, obesity, thyroid conditions, liver disease, diabetes, and certain medications can affect SHBG. A provider may order total testosterone, free testosterone, and SHBG together when the initial result is borderline or does not match the symptoms.

What Counts as Low Testosterone?

The American Urological Association uses a total testosterone level below 300 ng/dL as a reasonable cutoff supporting a diagnosis of testosterone deficiency.

However, one low result is not enough.

A clinical diagnosis generally requires:

• Symptoms or signs associated with testosterone deficiency
• Two separate total testosterone measurements
• Both tests performed early in the morning
• Consistently low results
• Evaluation for possible underlying causes

The AUA also states that low testosterone should only be diagnosed when low laboratory values are combined with relevant symptoms or signs.

Symptoms may occur in men whose total testosterone is above 300 ng/dL, including men in the 400s. That does not automatically mean testosterone is the cause.

Fatigue, low libido, poor focus, reduced motivation, and difficulty recovering can also be related to sleep apnea, thyroid disease, anemia, depression, stress, obesity, medications, or excessive training.

Numbers matter, but they do not tell the full story. Symptoms, laboratory findings, testing conditions, and overall health should be evaluated together.

The Athletic vs Sedentary Context

The same level of testosterone can have drastically different effects on two men.

A 50-year-old individual who is sedentary (sedentary lifestyle) may have no symptoms at all if they have a level of 500 ng/dL. He might sleep well, have a good sex drive and have no worries about energy or day-to-day function.

At the same time, a 40-year-old healthy athlete with the same levels may complain of fatigue, decreased training ability, or poor recovery. And in that case, that is a warning sign.

But this does not imply that the man who is athletic should have a higher level of testosterone. Other factors to consider include overtraining, training volume, calorie intake, stress, sleep, thyroid function, iron level, and medications.

Being an athlete isn't enough to justify the diagnostic standard. When determining the meaning of the symptoms, the context is important as it will help the provider understand what might be contributing to the symptoms.

Kingdom co-founder and 4-time Mr. Olympia Jay Cutler is all too familiar with this point of view. Cutler helped build Kingdom around the idea that providers should listen to patients, examine comprehensive lab information, and focus on more than a single number before engaging in treatment discussions.

You can learn more about the clinical team behind TRT Kingdom.

What About the 400 to 500 Range?

Many men receive a total testosterone result between 400 and 500 ng/dL and are told that everything is normal.

For many men, it is normal.

A result in this range is above the common AUA cutoff and does not, on its own, establish testosterone deficiency. Persistent symptoms still deserve attention, but the next step should be further evaluation rather than an automatic assumption that TRT is needed.

A provider may recommend:

• Repeating the test early in the morning
• Checking free testosterone and SHBG
• Evaluating sleep quality or possible sleep apnea
• Screening for thyroid problems or anemia
• Reviewing medications
• Looking at stress, nutrition, alcohol use, and training volume
• Checking for metabolic or cardiovascular risk factors

The Endocrine Society emphasizes that symptoms alone are not diagnostic. Reversible contributors, including obesity and medication use, should be considered before treatment.

Men comparing providers may also want to understand how much online TRT treatment costs.

What Is Considered High Testosterone?

There is no universal number that defines high testosterone for every man.

A result above the upper limit listed by your laboratory deserves review, particularly when it remains elevated on repeat testing or occurs during testosterone therapy.

Levels above 1,000 ng/dL may exceed the usual treatment target for many patients, although the significance depends on the laboratory method, age, timing, symptoms, and clinical context.

Excess testosterone exposure may contribute to:

• Acne or oily skin
• Increased hematocrit
• Reduced sperm production
• Testicular shrinkage
• Mood changes
• Higher estradiol levels
• Breast tenderness or gynecomastia in some men
• Increased blood pressure

Testosterone stimulates red blood cell production. When hematocrit rises too high, a provider may need to adjust treatment or investigate other contributing factors.

In 2025, the FDA required testosterone products to carry updated blood pressure warnings after ambulatory monitoring studies found class-wide increases in blood pressure. The same update removed boxed-warning language about increased cardiovascular outcomes after the TRAVERSE trial did not find an increased rate of major cardiovascular events.

The goal of medically supervised treatment is not to push testosterone as high as possible. It is to reach an appropriate physiologic level while monitoring safety and response.

Symptoms of Low Testosterone to Watch For

Possible symptoms of low testosterone include:

• Persistent fatigue that rest does not resolve
• Reduced libido
• Fewer spontaneous or morning erections
• Changes in erectile function
• Brain fog or difficulty concentrating
• Reduced motivation
• Irritability or low mood
• Loss of muscle mass or strength
• Increased body fat
• Reduced exercise endurance
• Poor recovery after training
• Low bone density
• Infertility
• Unexplained anemia

These symptoms can be significant, but they are not specific to testosterone deficiency.

For example, low energy can be related to poor sleep, anemia, depression, thyroid disease, medication effects, or chronic illness. Reduced libido may also have psychological, relationship, vascular, or medication-related causes.

Low testosterone is one possibility, not the only one.

The more persistent the symptoms are, and the more they affect daily life, the stronger the reason to seek a complete evaluation rather than relying on an online symptom checklist.

How to Test Your Testosterone Levels

An early-morning blood test is the standard starting point.

Testosterone levels fluctuate throughout the day and are generally highest in the morning, especially in younger men. Testing should usually be performed between approximately 7 and 10 a.m.

A low result should be confirmed with a second morning test on a separate day. The Endocrine Society also recommends repeating a morning fasting total testosterone measurement before making a diagnosis.

A comprehensive hormone panel may include:

• Total testosterone
• Free testosterone
• SHBG
• Estradiol
• Luteinizing hormone, or LH
• Follicle-stimulating hormone, or FSH
• Prolactin when clinically appropriate
• Complete blood count
• Thyroid or metabolic testing based on symptoms

LH and FSH help a provider investigate whether low testosterone may be related to the testicles, pituitary gland, or hypothalamus.

Testing may be arranged through a primary care doctor, endocrinologist, urologist, or telehealth platform that coordinates laboratory work and provider consultations.

For patients who qualify for treatment, a provider may discuss options such as the standard testosterone cypionate protocol. Treatment choice, dose, and monitoring should always be determined individually.

When Should You Consider Testosterone Replacement Therapy?

Testosterone replacement therapy is generally considered when two conditions are present:

1. Testosterone levels are consistently low on appropriate testing.
2. The patient has symptoms or signs consistent with testosterone deficiency.

The AUA supports using a total testosterone level below 300 ng/dL as part of that assessment. The Endocrine Society recommends treatment for men with symptoms and unequivocally, consistently low testosterone concentrations.

Some men with borderline results may require additional testing, particularly when free testosterone, SHBG, symptoms, and total testosterone do not align.

Before recommending TRT, a provider should evaluate why testosterone is low. Possible contributors include obesity, sleep disorders, pituitary conditions, testicular injury, medications, systemic illness, nutritional deficiency, or prior anabolic steroid exposure.

Fertility also matters. External testosterone can suppress sperm production and is generally not recommended for men actively trying to conceive. Other options may be discussed when preserving natural production is a priority.

TRT also requires continued monitoring. Depending on the patient, follow-up may include testosterone levels, hematocrit, blood pressure, symptom response, adverse effects, and prostate-related evaluation.

Treatment should come from a licensed provider, not a supplement shop or an unlicensed source.

A medically supervised testosterone therapy program should begin with laboratory testing, a health-history review, and a clinical consultation.

What You Can Do to Support Healthy Testosterone Naturally

Lifestyle changes can support healthy testosterone production, especially when weight, sleep, inactivity, nutrition, or stress are contributing factors.

Helpful steps may include:

• Perform resistance training consistently
• Include appropriate high-intensity exercise
• Get seven to nine hours of sleep
• Maintain a healthy body weight
• Avoid extreme calorie restriction
• Eat enough protein and calories to support activity
• Limit excessive alcohol use
• Manage chronic stress
• Address possible sleep apnea
• Correct confirmed vitamin D, zinc, or magnesium deficiencies

Research involving more than 200,000 men found associations between testosterone levels and factors such as age, body mass index, physical activity, medical conditions, and diet. The findings support addressing modifiable health and lifestyle factors when interpreting low testosterone results.

Lifestyle changes may help when the cause is reversible. They do not correct every case of true hypogonadism.

A man with a pituitary disorder, testicular dysfunction, genetic condition, or another medical cause may still require clinical treatment. Individual results vary, and no food, workout, or supplement can be expected to produce the same response in every person.

Source: Yeap et al., 2020. PubMed PMID 32979890.

The Bottom Line

Normal testosterone levels by age vary widely.

Age provides useful context, but it does not determine the right number by itself. Symptoms, testing time, free testosterone, SHBG, sleep, body composition, medications, and overall health all matter.

If you have persistent fatigue, reduced libido, changes in strength, poor concentration, or other possible symptoms, laboratory testing can help clarify what is happening.

TRT Kingdom offers online consultations with licensed providers who review health history and laboratory results before discussing treatment options.

You can start with a lab-based evaluation to find out whether your testosterone level warrants further review.

Medically reviewed by Daniel Olivero, MD, Chief Medical Officer

This article is for educational purposes only and does not replace individual medical advice, diagnosis, or treatment.

Frequently Asked Questions

What is the ideal testosterone level for a 40-year-old man?

There is no single ideal testosterone level for every 40-year-old. The result should be interpreted using the laboratory reference range, symptoms, free testosterone, SHBG, health history, and testing conditions.

Is 500 ng/dL a good testosterone level?

For many adult men, 500 ng/dL falls within a normal laboratory range. A provider should still consider symptoms and other health factors rather than judging the result in isolation.

Can testosterone levels vary throughout the day?

Yes. Testosterone is generally highest in the morning and lower later in the day. This is why early-morning testing is recommended when evaluating possible testosterone deficiency.

How often should I test my testosterone?

An initial low result should usually be repeated on a separate morning before a diagnosis is made. Patients receiving treatment should follow the testing and monitoring schedule set by their provider.

Do I need TRT if my levels are in the low-normal range?

Not necessarily. A provider should review your symptoms, repeat the test when appropriate, evaluate free testosterone and SHBG, and investigate other possible causes before discussing treatment.

Can lifestyle changes alone fix low testosterone?

Lifestyle changes may help when poor sleep, excess body fat, inactivity, stress, or nutrition are contributing factors. They may not correct hypogonadism caused by testicular, pituitary, genetic, or other medical conditions.

What is the difference between total and free testosterone?

Total testosterone includes testosterone that is bound to proteins and testosterone that circulates freely. Free testosterone measures the small unbound portion and may provide additional information when total testosterone is borderline or SHBG is abnormal.

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