What Are Normal Testosterone Levels by Age?

Every man’s testosterone levels fluctuate as he gets older, and levels can decline as much as 2 percent annually after age 30. (1) Knowing where your T levels stand and if they’re within the expected range can make a major difference in your health, confidence, and long-term vitality. Tracking hormone levels may be as important as monitoring blood pressure or cholesterol, since testosterone affects muscle strength, mood, energy, and sexual health.

Many men don’t realize they’ve started to lose testosterone until symptoms appear. That’s why understanding normal testosterone levels and how they change by age is so important. In this guide, we’ll explain what testosterone is, how it’s measured, and what normal levels look like in a testosterone levels chart for each age. We’ll also discuss why testosterone levels decline, the signs of low testosterone to look out for, and when to consider testing and treatment.

What Is Testosterone and How Is It Measured?

Testosterone is the primary male sex hormone. It plays a significant role in regulating maintain lean muscle, bone strength, energy, libido, and your overall well-being. Testosterone is at work in virtually every system of the body. It also supports heart health, strengthens bones, improves memory and focus, and helps regulate fat distribution. (2)

In the bloodstream, testosterone is measured in two main ways:

Total testosterone measures all the testosterone in circulation, most of which is bound to proteins such as sex hormone-binding globulin (SHBG) and albumin.
Free testosterone measures the small portion that is not bound to proteins and is available for immediate use by the body.

The distinction between free vs. total testosterone matters because two men could have identical total testosterone numbers, but if one has high SHBG levels, less of his testosterone is “free” and usable. (3) That man might feel the symptoms of deficiency even though his total number looks fine on paper.

Testing is usually performed with a simple blood draw. This test is often scheduled in the morning when testosterone naturally peaks, although the differences become less significant throughout the day for older men. (4) The most common units of measurement are nanograms per deciliter (ng/dL) for total testosterone and picograms per milliliter (pg/mL) for free testosterone.

Reference ranges vary by lab, but most experts agree that:

Total testosterone: roughly 300–1,000 ng/dL is considered normal
Free testosterone: about 50–210 pg/mL is considered normal

Anything consistently below 300 ng/dL for total testosterone is often classified as hypogonadism, or clinically low testosterone. (5)

Normal Testosterone Levels by Age

Testosterone peaks in early adulthood and gradually declines as men age. For younger men, T levels are typically higher than middle- and older-aged men. One study looked at the average levels of testosterone for men in their 20s and 30s and found that average levels peaked when men were in young adulthood, primarily in the young-to-mid 20s. (6)

Age Group	Average Total Testosterone (ng/dL)
20–24	409-558
25-29	413-575
30-34	359-498
35-39	352-478

Once men reach their 40s, their levels begin to decline at a more rapid pace. Here is what is generally considered normal ranges of testosterone for men 40 and older. (7)

Age Group	Average Total Testosterone (ng/dL)
40-49	252-916
50-59	215-878
60-69	196-859
70-79	156-819

Some men fall outside these brackets and remain healthy, while others begin experiencing symptoms at the higher end of the “normal” range. That’s why lab testing should always be paired with a discussion of how you feel and a full overview of your health history.

It’s also important to note that while falling below 300 ng/dL total testosterone is considered clinically low, many men experience the signs of low testosterone even when their numbers are technically within range, so you should always be on the lookout for possible symptoms of low testosterone.

Why Testosterone Declines With Age

Testosterone decline is part of the natural aging process, but the rate and severity vary widely. Several factors explain why men see their numbers shift over time:

Hormonal feedback loop changes: The hypothalamus and pituitary gland, which regulate testosterone production, become less efficient with age. This reduces stimulation of the testes, lowering hormone output.
Lifestyle influences: Several daily stressors and lifestyle habits can accelerate testosterone decline. Sleep deprivation, poor diet, chronic stress, alcohol, and smoking all suppress hormone production. Lack of regular exercise, especially resistance training, further compounds the problem. (8)
Medical conditions: Obesity, type 2 diabetes, thyroid disorders, and cardiovascular disease are strongly associated with lower testosterone. Medications such as opioids and corticosteroids can also reduce levels. (9)
Environmental exposures: Endocrine-disrupting chemicals found in plastics, pesticides, and certain household products may interfere with hormone balance over the long term such as by decreasing semen quality and reduce T levels. (10)

For some men, testosterone decline is gradual and manageable with lifestyle adjustments. For others, medical intervention becomes necessary to restore quality of life.

Symptoms of Low Testosterone at Different Ages

The symptoms of low testosterone don’t always appear overnight. Instead, they build slowly. Many men may attribute these symptoms to natural aging or stress. While those can both play a role, it’s important to understand symptom patterns so you can recognize when an issue is more serious.

30s: Men in their 30s often notice fatigue even with adequate sleep, difficulty maintaining workout performance, and slower muscle recovery, which can be an early sign of low testosterone. Brain fog and reduced motivation may also appear, which can negatively impact both their personal and professional life.
40s: As men enter their 40s libido tends to drop noticeably, weight gain becomes harder to control, and some men develop early signs of erectile dysfunction. Mood changes, including irritability or low patience, can also emerge.
50s and beyond: As men grow out of middle-age, low T symptoms often intensify. These may include muscle loss, reduced bone density, and greater risk of fractures. Emotional changes such as depression or loss of confidence are also more common. Men in this group also face higher risks of metabolic disorders like insulin resistance.

It’s important to note that while these are general guidelines, each situation will be different. Some men may experience more intense symptoms of low T in their 30s or even 20s, while others will see a much more gradual decline that may take decades to have a major impact on day-to-day life.

However, when these shifts do occur, they affect more than physical health. They can influence relationships, productivity at work, and overall life satisfaction. That’s why identifying and addressing the signs of low testosterone early can make such a difference.

When to Get Tested and Treatment Options

As we have seen, testosterone naturally declines over time, meaning not every man with lower-than-average testosterone levels needs treatment or testosterone therapy such as TRT.

But when numerous symptoms combine with low numbers, it’s time to consult a professional. A testosterone blood test can confirm where you stand, and whether further evaluation is needed.

Doctors don’t just look at a single number when making a determination. A thorough evaluation considers:

Blood tests for total and free testosterone, with repeat tests confirming results
Assessment of symptoms, medical history, and related conditions
Review of other hormones, such as thyroid and cortisol, that may impact testosterone balance (11)

If treatment is needed, testosterone replacement therapy can be delivered in several forms:

Injections: Administered weekly or biweekly for reliable dosing.
Gels or creams: Applied daily for steady absorption.
Pellets: Inserted under the skin and replaced every few months.

TRT is not one-size-fits-all, and ongoing medical supervision is critical to avoid side effects and keep levels within safe ranges. Your doctor will also work with you to ensure you are finding the appropriate TRT dosage levels for your needs. In many cases, doctors also recommend lifestyle changes to complement therapy, such as regular resistance training, improved sleep habits, stress management techniques, balanced nutrition, or even counseling for mental health issues such as depression.

At Gameday Men’s Health, our team specializes in helping men regain energy, confidence, and vitality through personalized hormone treatment plans. Whether you’re curious about your baseline or experiencing noticeable symptoms, scheduling a testosterone test with your local Gameday Men’s Health location is the best first step.

Taking Control of Your Testosterone Health

Testosterone is central to men’s health at every age. It can play a major role in influencing energy, mood, strength, and performance in the bedroom. While normal testosterone levels vary by age, consistently low results paired with multiple symptoms may signal the need for professional evaluation.

By understanding how levels change over time, recognizing the signs of low testosterone, and taking proactive steps, men can protect their long-term health and quality of life. If you’re ready to learn your numbers and take control of your health, contact your local Gameday Men’s Health clinic today.

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