Testosterone Levels by Age: Normal Ranges for Men and Women

What Are Normal Testosterone Levels?

Testosterone is the primary sex hormone in men and plays a vital role in women’s health too. It regulates muscle mass, bone density, fat distribution, mood, energy, libido, and cognitive function. But what counts as “normal” depends heavily on your age, sex, and individual biology.

Wondering where your testosterone levels stand? 1st Optimal’s at-home hormone testing gives you a complete picture of your total T, free T, and SHBG levels, all from the comfort of your home.

Most standard lab reports list a “normal” total testosterone range of roughly 264 to 916 ng/dL for men. That range spans all adult males from ages 19 to 80+, which means a 25-year-old and a 70-year-old are measured against the same benchmark. This is misleading because testosterone naturally declines with age, so what qualifies as optimal for you depends on where you are in life.

The American Urological Association (AUA) defines biochemical testosterone deficiency as a total testosterone below 300 ng/dL on two separate morning blood draws. The Endocrine Society uses 350 ng/dL as a threshold for evaluating symptomatic men. However, many functional medicine providers, including the clinical team at 1st Optimal, look beyond these cutoffs to assess symptoms alongside lab values.

What Are Normal Testosterone Levels by Age for Men?

Testosterone production in men peaks during the late teens and early 20s, then gradually declines at a rate of about 1 to 2% per year starting around age 30. This decline is well-documented in large population studies, including the Hypogonadism in Males (HIM) study and NHANES III data.

Here is a decade-by-decade breakdown of typical total testosterone ranges for men, based on population reference data:

Age Range	Total Testosterone (ng/dL)	Free Testosterone (pg/mL)
20 to 29	400 to 1,000	15 to 25
30 to 39	350 to 950	12 to 22
40 to 49	300 to 900	10 to 18
50 to 59	250 to 850	8 to 15
60 to 69	200 to 750	6 to 12
70 and older	150 to 700	4 to 10

These ranges represent approximate 5th to 95th percentile population data, not health thresholds. A man in his 30s with a total testosterone of 320 ng/dL may technically fall within the lab’s “normal” range, but that number is well below the median for his age group and could explain symptoms like fatigue, low libido, or difficulty building muscle.

What Are Normal Testosterone Levels for Women?

Testosterone is not just a male hormone. Women produce testosterone in the ovaries and adrenal glands, and it plays a critical role in energy, mood, bone health, and sexual wellness. Women’s testosterone levels are significantly lower than men’s, but even small declines can produce noticeable symptoms.

Age Range	Total Testosterone (ng/dL)	Free Testosterone (pg/mL)
20 to 29	20 to 75	1.0 to 5.0
30 to 39	15 to 70	0.8 to 4.5
40 to 49	10 to 60	0.6 to 3.5
50 to 59	7 to 50	0.4 to 2.5
60 and older	5 to 40	0.2 to 1.5

Women approaching perimenopause and menopause often experience a sharper decline in testosterone production. Research published in the Journal of Clinical Endocrinology and Metabolism found that testosterone levels in women drop by approximately 50% between the ages of 20 and 40, with further reductions during and after menopause. This decline contributes to fatigue, mood changes, reduced muscle tone, and low libido.

Why Does Total Testosterone Alone Not Tell the Full Story?

One of the most common mistakes in testosterone testing is relying solely on total testosterone. Total testosterone measures all testosterone in your blood, including testosterone bound to sex hormone-binding globulin (SHBG) and albumin. Only about 2 to 3% of your testosterone circulates as free testosterone, which is the biologically active form that your tissues can actually use.

SHBG levels rise naturally with age, and they can also increase due to liver conditions, thyroid dysfunction, and certain medications. A man with a total testosterone of 500 ng/dL but elevated SHBG may have a free testosterone level equivalent to someone with a total T of 300 ng/dL. The reverse is also true; a lower total T with low SHBG may still deliver adequate free testosterone to tissues.

This is why a comprehensive hormone panel matters. At 1st Optimal, providers evaluate total testosterone, free testosterone, SHBG, estradiol, and a full metabolic panel to build an accurate picture of your hormonal health. A single total T number does not provide enough information for meaningful clinical decisions.

Ready to see the full picture? Explore 1st Optimal’s comprehensive blood work panels to understand your total T, free T, SHBG, and more.

What Causes Testosterone Levels to Drop?

Age is the primary driver of declining testosterone, but several modifiable and non-modifiable factors can accelerate the decline:

• Poor sleep quality: Testosterone production peaks during deep sleep. Chronic sleep deprivation can reduce levels by 10 to 15% according to research published in the Journal of the American Medical Association.
• Excess body fat: Adipose tissue converts testosterone to estrogen through an enzyme called aromatase. Higher body fat percentages correlate strongly with lower testosterone in both men and women.
• Chronic stress: Sustained high cortisol levels suppress the hypothalamic-pituitary-gonadal (HPG) axis, directly reducing testosterone production.
• Sedentary lifestyle: Resistance training and high-intensity exercise have been shown to boost testosterone acutely and chronically. Inactivity has the opposite effect.
• Medications: Opioids, corticosteroids, and certain antidepressants can lower testosterone levels.
• Medical conditions: Type 2 diabetes, metabolic syndrome, obesity, and thyroid disorders are all associated with reduced testosterone.
• Environmental toxins: Endocrine-disrupting chemicals found in plastics, pesticides, and personal care products can interfere with hormone production.

How Do You Know If Your Testosterone Is Too Low?

Low testosterone, also called hypogonadism, produces a range of symptoms that often overlap with other conditions. Common signs include:

• Persistent fatigue and low energy despite adequate sleep
• Reduced libido or sexual dysfunction
• Difficulty gaining or maintaining muscle mass
• Increased body fat, especially around the midsection
• Brain fog, poor concentration, or memory issues
• Mood changes including irritability, anxiety, or depression
• Loss of motivation or drive
• Thinning hair or reduced body hair growth
• Hot flashes or night sweats (more common in women)

In men, the AUA recommends testing if two or more of these symptoms are present alongside a total testosterone below 300 ng/dL on two morning draws. In women, diagnosis is more nuanced because female reference ranges are less standardized, and providers must evaluate symptoms in the context of the menstrual cycle, menopause status, and other hormones like estrogen and progesterone.

How Should You Get Your Testosterone Tested?

Accurate testosterone testing requires attention to timing and methodology. Here is what to keep in mind:

1. Test in the morning: Testosterone levels peak between 7 and 10 AM and decline throughout the day. A morning blood draw provides the most reliable baseline.
2. Fast beforehand: Eating can temporarily lower testosterone levels. Fasting for 8 to 12 hours before your draw improves accuracy.
3. Test more than once: Testosterone levels fluctuate day to day. The AUA and Endocrine Society both recommend confirming results with a second test before making clinical decisions.
4. Request a comprehensive panel: Total testosterone alone is insufficient. Ask for free testosterone, SHBG, estradiol (E2), LH, FSH, prolactin, a complete blood count (CBC), and a metabolic panel.
5. Consider advanced testing: DUTCH hormone testing measures testosterone metabolites and provides insights into how your body processes hormones, going beyond what a standard blood draw can reveal.

Skip the clinic waiting room. 1st Optimal delivers at-home testing kits with comprehensive lab panels interpreted by licensed providers, so you get answers without the hassle.

What Can You Do About Low Testosterone?

If your labs confirm low testosterone relative to your age and you are experiencing symptoms, there are evidence-based approaches to address it:

Lifestyle Optimization

Before considering medical intervention, lifestyle factors should be addressed first. Prioritize 7 to 9 hours of quality sleep, engage in regular resistance training, manage stress through structured recovery practices, and maintain a healthy body composition. These changes alone can produce meaningful improvements in testosterone levels, particularly in men under 50 with mild deficiency.

Hormone Replacement Therapy

For men with confirmed hypogonadism, testosterone replacement therapy (TRT) is the standard of care. Options include weekly injections, topical creams, and oral formulations. TRT is prescribed at physiologic doses designed to restore levels to a healthy range, not push them to supraphysiologic levels.

For women, low-dose bioidentical testosterone therapy can address symptoms like fatigue, low libido, and cognitive fog. Treatment is carefully monitored to keep levels within the female physiologic range, typically using compounded testosterone creams at doses between 0.5 and 2 mg daily.

Ongoing Monitoring

Effective testosterone management requires regular lab monitoring. At 1st Optimal, members receive follow-up blood work at 6 to 8 weeks after starting therapy, then quarterly once levels stabilize. This ensures dosing stays optimized and side effects are caught early.

Frequently Asked Questions

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

For men in their 40s, normal total testosterone typically falls between 300 and 900 ng/dL, with a median around 500 to 600 ng/dL. Free testosterone generally ranges from 10 to 18 pg/mL. If you are in the lower end of this range and experiencing symptoms like fatigue or low libido, it may be worth discussing your results with a provider.

Do women need testosterone too?

Yes. Testosterone plays a vital role in women’s energy, mood, bone density, muscle maintenance, and sexual health. Women produce testosterone in smaller amounts than men, but even mild deficiencies can significantly impact quality of life, especially during perimenopause and menopause.

How often should I get my testosterone checked?

If you have no symptoms and are under 40, a baseline test every few years is generally sufficient. Men and women over 35 experiencing fatigue, low libido, mood changes, or difficulty managing weight should get a comprehensive hormone panel. If you are on hormone therapy, testing every 6 to 12 weeks initially and then quarterly is standard practice.

Can you increase testosterone naturally?

Yes, to a degree. Resistance training, adequate sleep (7 to 9 hours), stress management, maintaining a healthy body weight, and a nutrient-dense diet rich in zinc, vitamin D, and healthy fats can all support natural testosterone production. However, these strategies have limits, particularly for individuals with clinical hypogonadism or women in menopause.

What is the difference between total and free testosterone?

Total testosterone measures all testosterone in your blood, including testosterone bound to SHBG and albumin. Free testosterone measures only the unbound, biologically active form that your body can use. Since SHBG increases with age, a man with acceptable total testosterone may still have low free testosterone, which is why both should be tested together.

This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making changes to your health regimen. Individual results may vary based on health status, genetics, and adherence to treatment protocols.