Testosterone Levels by Age Chart: Insights from the Latest Research

Testosterone Levels by Age Chart

Understanding testosterone levels by age is crucial for diagnosing and managing hormonal health. At TRT Australia, we provide a comprehensive Testosterone Levels by Age Chart that outlines normal testosterone levels across various age groups.

What is Testosterone?

The Role of Testosterone in the Body

Testosterone is a vital hormone in the human body that affects various physical, sexual, and mental health aspects. It plays a crucial role in muscle mass, bone density, and libido. As men age, testosterone levels naturally decline, but knowing the normal ranges can help identify any deviations that might require medical attention.

How Testosterone Production Changes With Age

Testosterone production peaks during adolescence and early adulthood. As men get older, the level of testosterone naturally begins to decrease. Understanding this pattern can help anticipate changes in the body and address them proactively.

Testosterone Levels by Age

In a 2022 research project, scientists investigated the testosterone levels of 1,486 men aged between 20 and 44 to determine what could be considered typical or “normal” testosterone levels for various age groups. The study followed guidelines from the American Urological Association, which suggests using the middle third of testosterone values from a large sample as the standard for normal levels. Here’s a breakdown of their findings by age group:

Age Group Normal Testosterone Level (nmol/L) Normal Testosterone Level (ng/dL)
20-24 14.2 – 19.3 409 – 558
25-30 14.3 – 19.9 413 – 575
30-34 12.4 – 17.3 359 – 498
35-40 12.2 – 16.5 352 – 478
40-44 12.1 – 16.4 350 – 473


These results establish a conservative guideline for what’s considered normal, focusing strictly on the middle values. However, as more data is gathered and analyzed, these ranges may be adjusted to better reflect the natural variations in testosterone as men age.

Yet, understanding testosterone levels goes beyond simply knowing the numbers. It’s equally important to consider whether an individual exhibits symptoms related to low testosterone. This perspective is supported by another study of 434 men, which linked specific symptoms to certain testosterone thresholds:

  • Testosterone levels below 15 nmol/L might lead to reduced energy.
  • Falling below 12 nmol/L can correspond with weight gain.
  • A level under 10 nmol/L may contribute to feelings of low mood.
  • Levels dropping below 8 nmol/L are often associated with erectile dysfunction.

This study emphasizes that the absence of symptoms can also be a crucial indicator of health, even if a man’s testosterone levels are at the lower end of the normal range. Essentially, if a man doesn’t exhibit symptoms typically associated with low testosterone, his lower level might still be perfectly normal for him.

Such findings underscore the importance of a tailored approach to health assessment, where both the numbers and individual experiences are considered. As research in this field progresses, our understanding of testosterone’s impact on men’s health will continue to evolve, potentially leading to more personalized healthcare strategies.

For further details, refer to the studies referenced above here:
1.Exploring Normal Testosterone Levels
2.Associations Between Testosterone Levels and Symptoms

Understanding the Chart

Our testosterone levels by age chart provides a clear, visual representation of how hormone levels typically change as you age. This chart is a vital tool for any Australian looking to understand their hormonal health in relation to their age.

Teens to 20s

Testosterone levels are at their peak during the late teens and slowly start to decline thereafter. High testosterone levels during these years are crucial for physical development and reproductive functions.

30s to 40s

During this phase, men might start noticing a gradual decrease in testosterone, which can affect energy levels, muscle mass, and sexual health. Regular monitoring is advised to manage any potential health issues early.

50s and Beyond

As men enter their 50s, testosterone levels significantly decrease, which can lead to symptoms associated with low testosterone, such as reduced muscle strength, fatigue, and changes in mood. It’s important for men in this age group to have their levels checked regularly to maintain a healthy lifestyle.

Effects of Varying Testosterone Levels

Physical Health Implications

  • Low Libido: Testosterone plays a crucial role in maintaining libido; its deficiency can lead to diminished libido and dysfunction. This is due to testosterone’s key role in the biochemical pathways that support libido function
  • Muscle Mass and Bone Density: Testosterone enhances muscle protein synthesis, which is crucial for maintaining muscle mass and strength. It also stimulates the activity of osteoblasts, cells responsible for bone formation, thereby influencing bone density. Lower levels lead to decreased muscle mass and increased risk of bone fractures due to osteoporosis

Mental and Emotional Health

  • Mood Disorders: Testosterone influences brain functions and mood regulation. It modulates neurotransmitters that are critical for mood and behavior, such as serotonin and dopamine. Low levels of testosterone are correlated with an increased prevalence of mood disorders, such as depression and anxiety, likely due to its effects on neurotransmission and neuroplasticity, which affects how the brain adapts to new experiences, stress, and injury

How to Boost Your Testosterone Level?

Lifestyle Modifications

Simple lifestyle changes such as a balanced diet, regular exercise, and adequate sleep can significantly affect testosterone levels and overall hormonal health.

Medical Interventions

For those experiencing significant symptoms associated with low testosterone, TRT Australia offers treatments that can help manage levels effectively. Book a Free Consultation with a specialist to discuss your eligibility.

TRT Australia: Your Partner in Hormonal Health

At TRT Australia, we are committed to providing our clients with the latest and most accurate information on testosterone and hormonal health. Whether you are experiencing symptoms of hormonal imbalance or just looking for preventive measures, our team is here to support you at every stage of life.

Frequently Asked Questions

What is considered a normal testosterone level?

Normal testosterone levels vary widely depending on age, lifestyle, and overall health. According to the study listed above a normal testosterone level for adult men is around 8.7–29 nmol/L (250–836 ng/dL). Our age-specific chart provides a detailed breakdown to help you understand what is normal for your age group.

How often should I check my testosterone levels?

It is advisable to check testosterone levels at least once every five years if you are under 40 and more frequently as you age or if symptoms of low testosterone appear. To name a few common symptoms;

  • Fatigue and decreased energy levels
  • Reduced libido
  • Poor sleep
  • Mood disturbances

For someone on Testosterone Replacement Therapy (TRT), monitoring testosterone levels is more frequent and essential to ensure effective management and adjust dosages as necessary. We recommend every 3-4 months to get levels checked if you’re currently on doctor monitored TRT.

Can lifestyle changes improve my testosterone levels?

Yes! Here is the science to prove it.

Weight Management and Testosterone:
Adipose tissue, especially visceral fat, secretes enzymes like aromatase which convert testosterone into estrogen, thereby reducing the overall testosterone levels in the body. Excess body fat also leads to a state of chronic low-grade inflammation, which can further suppress testosterone production by affecting the hypothalamic-pituitary-gonadal (HPG) axis. Losing weight reduces the mass of adipose tissue, decreases the activity of aromatase, and alleviates inflammation, leading to a restoration of testosterone levels

Evidence: The study by Camacho and colleagues observed that weight loss was associated with proportional increases in testosterone and SHBG, both of which contribute to higher bioavailable testosterone.


Physical Activity and Testosterone
Regular physical activity, especially aerobic exercise, stimulates the central nervous system and hypothalamus to increase the secretion of gonadotropin-releasing hormone (GnRH). This, in turn, enhances the production of luteinizing hormone (LH) by the pituitary gland, which directly stimulates the Leydig cells in the testes to produce more testosterone. Moreover, exercise helps in reducing insulin resistance and improving glucose metabolism, which are associated with higher testosterone levels

Evidence: Kumagai et al. found that serum testosterone levels were significantly higher in the group engaging in high physical activity compared to those in low activity groups, indicating the direct effect of exercise on testosterone production.


Diet and Nutrition:
A balanced diet rich in certain nutrients like zinc, vitamin D, and omega-3 fatty acids can enhance testosterone production. Zinc plays a crucial role in the enzymatic processes that create testosterone in the testes. Vitamin D acts at the level of the DNA in Leydig cells, promoting the transcription of genes involved in testosterone synthesis. Omega-3 fatty acids improve cellular receptor sensitivity to LH, enhancing the testes’ responsiveness to hormonal signals that trigger testosterone production.

Evidence: Although specific studies directly linking diet modifications alone to increased testosterone are limited, the combined effects of diet and exercise have been shown to improve hormonal profiles, suggesting that nutrient intake does play a role in modulating testosterone levels.


Using a combination of weight management, increased physical activity, and a balanced diet, paired with clinical monitoring and guided testosterone therapy, is one of the most effective approaches to enhancing overall well-being in men with low testosterone levels. Clinical oversight ensures that any hormonal supplements are administered safely, optimizing dosage and minimizing potential side effects. This integrative strategy not only addresses the physiological aspects of testosterone deficiency by naturally increasing endogenous testosterone production but also enhances the effectiveness of supplementation through a holistic focus on lifestyle improvements. The dual approach of lifestyle modification and medical intervention, when carefully monitored by healthcare professionals, can lead to significant improvements in physical health, mental clarity, and emotional stability. 

What are the symptoms of low testosterone?

Symptoms of low testosterone include fatigue, reduced libido, weight gain, and emotional changes. If you notice these symptoms, it is advisable to consult a healthcare provider.

Does TRT Australia provide treatments for low testosterone?

Yes, TRT Australia offers a range of treatments tailored to your individual needs and health conditions. Consulting with our specialists can guide you to the best treatment options. Book your Free Consultation today.

How to get tested for low testosterone

If you have concerns about low T and are considering getting tested for low testosterone, our comprehensive blood test is an ideal starting point. Designed for simplicity and accuracy, our test will measure your testosterone levels, providing critical insights into your hormonal health. Visit our blood test page to learn more about how our specialised testing can assist you and confirm your eligibility for TRT in Australia.


At TRT Australia, we understand the importance of maintaining optimal testosterone levels for overall health and well-being. Our testosterone levels by age chart is a crucial tool for any Australian man seeking to understand his hormonal health. By staying informed and proactive, you can ensure that your body remains vigorous and healthy throughout the different stages of life.

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Written by TRT Resources Australia

May 13, 2024

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