Testosterone is a hormone your body uses every day. It supports energy, mood, muscle strength, bone health, and sex drive. While many people think of it as a male hormone, both men and women need testosterone to feel well.
Normal testosterone levels by age change over time. Levels are higher in youth and early adulthood, then slowly decline as you get older. This is a natural process, but it can still raise questions or concerns when you start feeling different.
What Is Testosterone and Why It Matters?
Testosterone is a steroid hormone that plays a key role in how your body grows, repairs, and functions. It helps regulate muscle mass, bone strength, red blood cell production, fat distribution, energy levels, and sex drive. It also affects mood, focus, and overall sense of well-being.
Testosterone is often labeled as a male hormone, but that is only part of the story. Men produce higher amounts, mainly in the testes. Women also produce testosterone in smaller amounts, mainly in the ovaries and adrenal glands. Even at lower levels, testosterone is essential for women’s health.
For men, testosterone supports:
- Sexual development and function
- Muscle size and strength
- Bone density
- Sperm production
- Energy and motivation
For women, testosterone helps support:
- Sexual desire and arousal
- Energy and stamina
- Mood stability
- Muscle and bone health
- Cognitive function
Normal testosterone levels by age naturally change as you move through different life stages. In men, levels often peak in early adulthood and slowly decline over time. In women, levels are much lower overall and tend to decrease with age, especially around perimenopause and menopause.
What’s the Normal Testosterone Levels by Age?
Normal testosterone levels by age are measured using a blood test and reported in nanograms per deciliter, or ng/dL. These ranges help doctors understand what is typical at different life stages, but they are not meant to be used in isolation.
Your age, sex, symptoms, overall health, and even the lab used for testing all matter when interpreting results. That is why it is important to look at testosterone levels by age instead of comparing yourself to one single number.
Normal Testosterone Levels by Age for Men
In men, testosterone levels rise sharply during puberty, peak in early adulthood, and then slowly decline with age. This decline is gradual and normal, but symptoms may appear if levels drop below the expected range for your age.
Here are typical testosterone levels in men by age:
| Age | Testosterone Level |
|---|---|
| Male infants (0 to 6 months) | 75 to 400 ng/dL |
| Children around age 10 | 7 to 130 ng/dL |
| Early teens (12 to 13 years) | 7 to 800 ng/dL |
| Mid teens (15 to 16 years) | 100 to 1,200 ng/dL |
| Late teens (17 to 18 years) | 300 to 1,200 ng/dL |
| Adults (19 years and older) | 300 to 1,000 ng/dL |
If you are an adult man and your testosterone level falls below 300 ng/dL, it may be considered low, especially if you have symptoms. However, some men may feel symptoms even within the normal range, while others feel fine at the lower end.
Normal Testosterone Levels by Age for Women
Women also rely on testosterone for daily function, even though levels are much lower than in men. Normal testosterone levels by age for women support sexual health, energy, mood, and bone strength.
Typical testosterone levels in women include:
| Age | Testosterone Level |
| Ages 1 to 10 | 2.5 to 10 ng/dL |
| Ages 10 to 18 | 15 to 38 ng/dL |
| Premenopausal women | 10 to 55 ng/dL |
| Postmenopausal women | 7 to 40 ng/dL |
Testosterone levels in women tend to decline with age, especially during perimenopause and menopause. Low levels may be linked to fatigue, low libido, mood changes, or reduced muscle strength.
Why Do Testosterone Levels Drop?
Normal testosterone levels by age decline over time for several natural reasons. As you get older, the body becomes less efficient at producing and regulating testosterone, which can affect how you feel.
Testosterone production is guided by signals between the brain and the testes in men. With age, these signals weaken. The testes respond less to hormone signals, and the brain releases fewer instructions to produce testosterone.
Certain health conditions can further lower testosterone levels by age, including obesity, type 2 diabetes, liver disease, and kidney disease.
Lifestyle factors also matter. Chronic stress, poor sleep, low activity, and poor nutrition can all contribute to lower testosterone. While aging is unavoidable, healthy habits may help support more balanced hormone levels over time.
What are the Common Signs of Low Testosterone?
When normal testosterone levels by age drop too low, your body often gives you signals. These symptoms can develop slowly and may be easy to overlook at first. They also vary from person to person.
Common Signs of Low Testosterone in Men
Low testosterone symptoms in men may affect physical health, mood, and sexual function. Common signs include:
- Reduced sex drive
- Erectile dysfunction
- Low sperm count or fertility concerns
- Increased body fat, including breast tissue
- Decrease in testicle size
- Loss of muscle mass and strength
- Low endurance or frequent fatigue
- Depressed mood or irritability
- Trouble focusing or brain fog
- Reduced bone density
Some men notice symptoms even when their testosterone level falls within the lower end of the normal range for their age. This is why symptoms matter just as much as lab results.
Common Signs of Low Testosterone in Women
Low testosterone in women is less talked about, but it can still affect daily life. Symptoms may include:
- Low sexual desire
- Ongoing fatigue or low energy
- Mood changes or low motivation
- Decreased muscle strength
- Reduced sense of well-being
Because testosterone levels in women are naturally low, even small changes can cause noticeable symptoms. If these signs persist, testing may help clarify what is going on.
How Testosterone Level Is Tested?
Testing helps you understand where your testosterone levels fall for your age. It is usually done with a simple lab test that measures testosterone in your blood. Results are reported as total testosterone and sometimes free testosterone.
Blood Testing for Testosterone Levels by Age
Most testosterone tests use a blood sample. Doctors often recommend testing in the morning because testosterone levels are highest earlier in the day.
A blood test may measure:
- Total testosterone, which includes both bound and unbound testosterone
- Free testosterone, which is the active form your body can use
Your provider may repeat the test if results are borderline or do not match your symptoms.
At-Home Testosterone Testing
At-home testing makes it easier to check testosterone levels by age without visiting a clinic. These tests are private, convenient, and done on your schedule.
Most at-home testosterone tests work by having you collect a small sample and mail it to a lab for analysis.
Common sample types include:
- Finger-prick blood sample, placed on a card or collected in a small tube
The basic process is simple:
- Order and receive the test kit
- Collect your sample using clear instructions
- Mail the sample to the lab using prepaid packaging
- View your results online within a few days
Many at-home tests focus on total testosterone, while some also include free testosterone or related hormones for more context.
At-home testing can be a helpful first step if you are experiencing symptoms or want a baseline reading. Soon, Acensa will offer at-home hormone testing to help you track results and keep your health information in one place.
What to Do If Your Testosterone Levels Are Low or High?
Seeing your testosterone results can bring relief, confusion, or concern. Whether your levels are low, high, or borderline, the next steps depend on your age, symptoms, and overall health.
What to Do If Testosterone Levels Are Low?
If your testosterone levels are low for your age and you have symptoms, a healthcare provider may talk with you about treatment options. The goal is not just to raise numbers, but to help you feel better.
Possible next steps may include:
- Reviewing your symptoms and medical history
- Repeating the test to confirm results
- Making lifestyle changes such as improving sleep, nutrition, stress management, and physical activity
In some cases, Testosterone Replacement Therapy, also called TRT, may be discussed. TRT can be given through injections, gels, patches, pellets, or nasal sprays. It is typically used when low testosterone is confirmed and symptoms are affecting daily life.
What to Do If Testosterone Levels Are High?
High testosterone levels are less common, but they can happen. In men, this may be linked to supplements or steroid use. In women, high levels may be associated with conditions like polycystic ovary syndrome.
If your testosterone levels are higher than normal for your age, your provider may:
- Look for an underlying cause
- Review medications or supplements
- Recommend lifestyle changes or targeted treatment
Managing high testosterone focuses on addressing the root cause rather than just lowering the number.
No matter where your results fall, normal testosterone levels by age are only one part of the picture. Working with a trusted provider helps ensure your care is safe, appropriate, and tailored to you.
Final Thoughts
Normal testosterone levels by age can explain a lot about how your body feels over time, but they are not something to fear. Hormone levels change as you age, and small shifts are a normal part of life.
What matters most is how you feel day to day. Ongoing fatigue, mood changes, low libido, or loss of strength are signals worth paying attention to. Testing can help connect the dots, but numbers should always be viewed alongside symptoms and overall health.
If you prefer privacy or convenience, at home testing can make checking testosterone levels by age easier and less stressful. Soon, Acensa will offer at home hormone testing to help you track results, store records, and stay organized in one place.
FAQs
1. Can low testosterone affect fertility?
Yes. In men, low testosterone can lower sperm count and make it harder to conceive. In women, it may be linked to irregular ovulation or a drop in sexual desire. If getting pregnant is a concern, hormone testing and guidance from a healthcare provider can help.
2. Can lifestyle changes raise testosterone levels naturally?
Yes. Eating well, staying active, getting enough sleep, and managing stress can all support healthy testosterone levels. For mild hormone imbalances, these changes may help before medication is needed.
3. Should women get testosterone tested?
Yes, especially if symptoms show up. Low energy, low libido, irregular periods, excess hair growth, or severe acne can all point to an imbalance. Testing is often helpful during perimenopause, menopause, or when conditions like PCOS are suspected.
4. How often should testosterone levels be checked?
It depends on your situation. Early testing may happen every few months while finding the right treatment. Once levels are stable, testing is often done yearly. For general screening or mild symptoms, once a year is common. Morning tests usually give the most accurate baseline results.
5. What is testosterone hormone therapy?
Testosterone hormone therapy helps replace low testosterone levels in the body. It’s most often used for men with medically diagnosed low testosterone to ease symptoms like fatigue, low sex drive, and muscle loss. Treatment can come as injections, gels, patches, or pellets. While it can be helpful, it’s important to talk through the benefits and possible side effects with a healthcare provider first.
