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Men's Hormones

TESTOSTERONE LEVELS
BY AGE

Creator: Missy Zammichieli, DNP, APRN, FNP-BC
Published: 2026-04-12

Normal ranges, optimal ranges, free testosterone, and why the number on your lab report may not mean what you think it means.

Medically reviewed by Missy Zammichieli, DNP, APRN, FNP-BC · Updated April 2026

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QUICK ANSWER: TESTOSTERONE RANGES BY AGE

Here's the data you came for. The table below shows both the standard lab reference ranges and the optimal performance ranges for total testosterone by age. The "normal" lab range represents the 2.5th to 97.5th percentile of the tested population — which includes sick, obese, and sedentary men. The "optimal" range is where most men feel and perform their best.

Age Range	"Normal" Lab Range (ng/dL)	Optimal Performance Range (ng/dL)
20-29	270-1,070	600-900
30-39	250-1,000	550-850
40-49	200-900	500-800
50-59	170-750	450-750
60-69	150-700	400-700
70+	100-650	350-650

Key takeaway: A total testosterone of 300 ng/dL is technically "normal" at almost any age. But "normal" and "optimal" are not the same thing. A 35-year-old at 300 ng/dL may be within the lab's reference range, but he's likely experiencing symptoms — fatigue, low libido, brain fog, loss of muscle mass. The number matters, but so does how you feel.

TOTAL TESTOSTERONE VS FREE TESTOSTERONE

Most lab tests report total testosterone. Most doctors look at total testosterone. But total testosterone alone is misleading. Here's why.

Total testosterone measures everything in your blood — bound and unbound. But roughly 97-98% of your testosterone is bound to proteins, primarily SHBG (sex hormone-binding globulin) and albumin. Only 2-3% circulates as free testosterone — and that's the fraction your body can actually use.

Think of it this way: total testosterone is your gross income. Free testosterone is your take-home pay. A man with a total T of 500 ng/dL and low SHBG may have more bioavailable testosterone than a man with a total T of 700 ng/dL and high SHBG.

Marker	"Normal" Lab Range	Optimal Range	Why It Matters
Free Testosterone	5-21 pg/mL	15-25 pg/mL (men under 50)	The testosterone your body can actually use
SHBG	10-57 nmol/L	20-40 nmol/L	Binds testosterone — high SHBG = less free T
Total Testosterone	264-916 ng/dL	500-900 ng/dL	Starting point — incomplete without free T and SHBG

Why Your Total T Can Be 500 and You Still Feel Terrible

SHBG increases with age, and it also increases with liver conditions, hyperthyroidism, low caloric intake, and certain medications. When SHBG rises, it grabs more testosterone and locks it up. Your total T looks fine on paper, but the testosterone your cells actually receive is low. This is one of the most commonly missed findings in standard hormone testing.

What SHBG Does

SHBG (sex hormone-binding globulin) is a protein made by the liver. Its job is to transport testosterone through the bloodstream. Once testosterone is bound to SHBG, it can't enter cells or activate androgen receptors. It's essentially in transit and unavailable. This is why measuring SHBG alongside total and free T gives a complete picture that total T alone never can.

Bottom line: If you've only had your total testosterone tested, you have an incomplete picture. Free testosterone is what your body actually uses. SHBG determines how much of your total T is available. Testing all three is the minimum for an accurate hormone assessment.

TESTOSTERONE LEVELS BY AGE: THE FULL CHART

The reference ranges below are compiled from published endocrine literature and major commercial lab standards. The "normal" column represents the 2.5th to 97.5th percentile — meaning it includes the values seen in 95% of the tested population. The problem is that the tested population includes men who are overweight, sedentary, chronically stressed, sleep-deprived, and medically ill. Including these populations drags the lower end of "normal" down significantly.

The optimal performance range reflects where healthy, active men typically feel and function best — based on clinical observation and symptom correlation. This is not a medical diagnosis threshold. It's a performance-oriented interpretation of the data.

Age	"Normal" Total T (ng/dL)	Optimal Total T (ng/dL)	Average Decline	Notes
20-29	270-1,070	600-900	Peak years	Testosterone peaks in early 20s
30-39	250-1,000	550-850	~1% per year	Gradual decline begins around 30
40-49	200-900	500-800	~1-2% per year	SHBG starts rising; free T drops faster than total T
50-59	170-750	450-750	~1-2% per year	Symptoms become more common in this decade
60-69	150-700	400-700	~1-2% per year	~30% of men over 60 meet criteria for low T
70+	100-650	350-650	Continued decline	Up to 50% of men over 80 have clinically low T

Free Testosterone Reference Ranges

Age	"Normal" Free T (pg/mL)	Optimal Free T (pg/mL)	Notes
20-29	9.3-26.5	18-25	SHBG is typically lowest in this decade
30-39	8.7-25.1	15-22	Free T begins declining slightly
40-49	6.8-21.5	13-20	Rising SHBG accelerates free T decline
50-59	5.9-18.1	11-18	Free T may drop even if total T holds
60-69	5.0-16.5	9-15	Many men symptomatic in this range
70+	3.5-12.5	7-12	SHBG continues to rise with age

Important: Free testosterone ranges vary significantly between labs depending on the assay method used (equilibrium dialysis vs. calculated vs. analog immunoassay). The values above are general reference points. Your provider should interpret your results using the specific reference ranges from the lab that processed your blood.

NORMAL VS OPTIMAL: WHY THE DIFFERENCE MATTERS

When your doctor says your testosterone is "normal," what they mean is that your number falls within the lab's reference range. That range is typically 264-916 ng/dL or 300-1,000 ng/dL depending on the lab. The problem with this framing is that "normal" is a statistical concept, not a clinical one.

Reference ranges are calculated from the 2.5th to 97.5th percentile of the lab's tested population. That population includes men who are obese, diabetic, sedentary, chronically stressed, and taking medications that suppress testosterone. Including these individuals in the reference pool drags the lower bound of "normal" far below where a healthy man should be.

A total testosterone of 300 ng/dL is "normal" for a 55-year-old according to the lab report. But that same man may be experiencing fatigue, low libido, depression, brain fog, loss of muscle mass, and increased body fat. He's "normal" by definition but symptomatic by experience.

The "Normal" Problem

Standard lab ranges tell you whether you're statistically typical. They don't tell you whether you're functioning well. A fasting glucose of 99 mg/dL is "normal" but already reflects insulin resistance. A total T of 280 ng/dL is "normal" in a 60-year-old but correlates with significant symptoms in most men. Normal is the floor, not the target.

The Performance Lens

At Moonshot Medical, we interpret blood work through a performance lens. We're not asking "is this man sick?" — we're asking "is this man functioning at his potential?" That's a fundamentally different question, and it produces fundamentally different recommendations. Learn more about this approach in our optimal vs normal blood work guide.

This doesn't mean every man below optimal needs treatment. Context matters. A 55-year-old at 480 ng/dL with no symptoms, good body composition, strong libido, and sharp cognition doesn't need intervention just because his number is below 500. But a 38-year-old at 350 ng/dL with fatigue, low sex drive, and difficulty maintaining muscle deserves more than "your labs are normal."

WHY TESTOSTERONE IS DECLINING

This isn't just an aging story. Population-level testosterone has been declining for decades — independent of age.

A landmark 2007 study by Travison et al., published in the Journal of Clinical Endocrinology & Metabolism, analyzed testosterone trends in Massachusetts men from 1987 to 2004.^[1] The finding: age-matched testosterone levels declined approximately 1% per year across the study period. A 65-year-old man in 2004 had roughly 15% lower testosterone than a 65-year-old man in 1987 — same age, different era, lower testosterone.

This has been confirmed by subsequent studies in Denmark, Finland, and Australia.^[2,3] The decline is real, it's population-wide, and it's not fully explained by rising obesity rates alone. Something in our environment is suppressing testosterone at a generational level.

Obesity and Metabolic Disease

Adipose tissue contains aromatase, an enzyme that converts testosterone to estradiol. More body fat means more aromatase activity and lower testosterone. Obesity also increases insulin resistance, which further suppresses testosterone production. This is the single largest modifiable factor — but it doesn't explain the full population-level decline.^[4]

Endocrine-Disrupting Chemicals

BPA, phthalates, PFAS ("forever chemicals"), pesticides, and other synthetic compounds interfere with the endocrine system. They're in plastic packaging, water supplies, food containers, personal care products, and building materials. Exposure is essentially universal in industrialized countries, and research links several of these compounds to reduced testosterone and impaired reproductive function.^[5]

Sleep Deprivation

Testosterone is primarily produced during sleep, with peak secretion occurring during REM cycles. Research shows that restricting sleep to 5 hours per night for just one week reduces testosterone by 10-15%.^[6] The average American sleeps 6.8 hours — down from 7.9 hours in 1942. Chronic sleep restriction is a direct testosterone suppressor.

Chronic Stress

Cortisol and testosterone have an inverse relationship. Sustained psychological stress elevates cortisol, which directly suppresses GnRH (gonadotropin-releasing hormone) and downstream testosterone production. Modern life delivers chronic low-grade stress that our endocrine systems aren't designed to handle.

Sedentary Lifestyles

Resistance training and high-intensity exercise stimulate acute testosterone release and support long-term hormonal health. The shift toward sedentary desk work, screen-based entertainment, and reduced physical labor means fewer men are getting the exercise stimulus that supports testosterone production.

Dietary Changes

Increased consumption of processed foods, seed oils, and refined carbohydrates — combined with decreased intake of cholesterol (the raw material for testosterone synthesis), zinc, magnesium, and vitamin D — contributes to suboptimal hormonal environments. Caloric excess drives obesity; caloric restriction drives SHBG up. Both hurt testosterone.

The implication: When your doctor says "your testosterone is normal for your age," that "normal" is already lower than it would have been 30 years ago. You're being compared to a population that is, as a whole, hormonally compromised. That doesn't mean your level is acceptable — it means the baseline has shifted downward.

SYMPTOMS OF LOW TESTOSTERONE BY LEVEL

Symptoms don't follow a clean threshold — they exist on a spectrum. But here's a rough correlation between total testosterone levels and the symptoms men typically report. Individual variation is significant; some men are highly symptomatic at 400 ng/dL while others feel fine at 350 ng/dL.

600+ ng/dL

Generally Asymptomatic

Most men with total testosterone above 600 ng/dL and adequate free T don't report testosterone-related symptoms. Energy, libido, body composition, mood, and cognition are typically well-maintained. This is the range most clinicians consider optimal.

400-600 ng/dL

Subtle Symptoms May Appear

This is the gray zone. Some men feel fine here; others notice reduced energy, slightly lower libido, longer recovery from workouts, mild brain fog, or difficulty maintaining muscle mass. Symptoms are often attributed to "just getting older" — which may be partially true, but low-normal testosterone is often a contributing factor. Free T levels matter significantly in this range.

300-400 ng/dL

Noticeable Symptoms Common

Most men in this range report multiple symptoms: persistent fatigue, reduced libido, difficulty with erections, increased body fat (especially abdominal), loss of muscle mass, irritability or depressed mood, poor concentration, and longer recovery from exercise. These symptoms are often significant enough to impact quality of life. See our full low testosterone symptoms guide for details.

<300 ng/dL

Clinical Hypogonadism

Below 300 ng/dL on two separate morning blood draws meets the Endocrine Society's diagnostic criteria for male hypogonadism.^[7] Symptoms are typically significant: severe fatigue, erectile dysfunction, markedly reduced libido, depression, loss of body hair, decreased bone density, significant muscle wasting, and cognitive impairment. Medical evaluation and treatment should be strongly considered at this level.

Symptoms matter as much as numbers. A man at 320 ng/dL with no symptoms may not need treatment. A man at 380 ng/dL who can't get through the afternoon, has lost interest in sex, and can't think clearly deserves investigation. The number informs the decision; it doesn't make the decision.

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WHAT LABS SHOULD YOU TEST?

Most primary care doctors order a single test: total testosterone. If it comes back above 300 ng/dL, you're told you're normal. This is insufficient. Testosterone doesn't exist in isolation — it interacts with estrogen, thyroid hormones, binding proteins, and pituitary signals. Testing total T alone is like checking your bank account balance without knowing your expenses.

Here's what a comprehensive hormone evaluation actually requires, and what Moonshot Medical's 60+ biomarker panel includes. For a deeper dive, see our full guide on what labs to test.

Marker	What It Tells You	Why It Matters
Total Testosterone	Overall testosterone production	Starting point — but incomplete alone
Free Testosterone	Bioavailable testosterone	What your body actually uses — often low when total T looks fine
SHBG	How much T is being bound	Explains the gap between total T and free T
Estradiol (E2)	Estrogen level	High estradiol suppresses testosterone and causes symptoms. Critical to monitor on TRT.
LH (Luteinizing Hormone)	Pituitary signal to produce T	Distinguishes primary (testicular) from secondary (pituitary) causes of low T
FSH	Pituitary signal for sperm production	Important for fertility assessment and diagnosing cause of low T
DHEA-S	Adrenal androgen precursor	Declines with age; low levels may compound testosterone deficiency
Prolactin	Pituitary hormone	Elevated prolactin suppresses testosterone; may indicate pituitary issue
CBC	Red and white blood cell counts	Baseline for TRT monitoring (testosterone raises hematocrit)
Metabolic Panel	Liver, kidney, glucose, lipids	Overall health context; liver health affects SHBG production
Thyroid (TSH, Free T4)	Thyroid function	Hypothyroidism mimics low-T symptoms; must be ruled out

Timing matters: Testosterone peaks between 7-10 AM and can drop 20-30% by afternoon. Blood should be drawn in the morning, fasted, after a normal night's sleep. A single afternoon blood draw showing 380 ng/dL may actually represent a morning level of 500+ ng/dL. This is why the Endocrine Society requires two morning draws for diagnosis.

WHAT IF YOUR LEVELS ARE LOW?

Low testosterone has a treatment spectrum. Not every man with a low number needs TRT (testosterone replacement therapy). The right intervention depends on how low your levels are, what's causing them, and whether lifestyle changes can move the needle.

Step 1: Lifestyle Optimization

For men in the 350-500 ng/dL range with mild symptoms, lifestyle changes should be the first intervention. These aren't platitudes — they produce measurable testosterone increases in research:

Sleep: 7-9 hours of quality sleep. This alone can raise testosterone 10-15%.^[6]
Resistance training: Compound lifts (squats, deadlifts, presses) 3-4x per week. Resistance training is the single most effective exercise stimulus for testosterone.
Body composition: Losing excess body fat reduces aromatase activity and estradiol production, allowing testosterone to rise. A 10% reduction in body fat can significantly improve T levels.
Stress management: Chronic cortisol elevation directly suppresses testosterone production. Structured stress management (not just "relax more") makes a measurable difference.
Nutrition: Adequate calories (not chronic restriction), sufficient dietary fat and cholesterol, and key micronutrients — zinc, magnesium, vitamin D, and boron all support testosterone production.

Step 2: Medical Evaluation

If lifestyle optimization doesn't produce adequate improvement, or if levels are below 300 ng/dL with significant symptoms, a full medical workup is warranted. This includes the comprehensive blood panel described above, physical exam, and review of medications that may be suppressing testosterone (opioids, certain antidepressants, corticosteroids). The goal is to identify and address the root cause — not just treat the number.

Step 3: TRT (When Warranted)

Testosterone replacement therapy is appropriate when levels are persistently low (typically below 300 ng/dL on two morning draws), symptoms are significant, and lifestyle interventions haven't resolved the issue. TRT can restore testosterone to optimal levels and meaningfully improve quality of life — but it requires ongoing monitoring and has implications for fertility, hematocrit, and cardiovascular markers. It's a medical intervention, not a lifestyle hack. Read our comprehensive TRT guide for the full picture.

Our approach: At Moonshot Medical, we don't push TRT as the default answer. We start with comprehensive testing to understand the full hormonal picture, address lifestyle and metabolic factors first, and recommend TRT only when the data and symptoms justify it. Learn more about our men's hormone services.

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TESTOSTERONE LEVELS FAQ

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

The standard lab reference range for a 40-year-old man is 200-900 ng/dL for total testosterone. However, the optimal performance range is 500-800 ng/dL. A level of 250 ng/dL is technically "normal" but may cause fatigue, low libido, brain fog, and loss of muscle mass. At Moonshot Medical, we interpret results through a performance lens — not just whether you fall within the lab's broad range.

What's the difference between total testosterone and free testosterone?

Total testosterone measures all testosterone in your blood — bound and unbound. Free testosterone measures only the unbound portion (about 2-3% of total T) that your body can actually use. SHBG (sex hormone-binding globulin) binds testosterone and makes it inactive. You can have a total T of 500 ng/dL but if your SHBG is high, very little of that testosterone is bioavailable. This is why testing free T alongside total T is essential for an accurate picture.

At what testosterone level should I consider TRT?

There is no single number that automatically qualifies you for TRT. Clinical guidelines typically define hypogonadism as total testosterone below 300 ng/dL on two morning blood draws plus symptoms. However, many men experience significant symptoms in the 300-450 ng/dL range. The decision should factor in your total T, free T, symptoms, age, and whether lifestyle interventions (sleep, exercise, weight loss, stress management) have been tried first. TRT is one tool — not the default answer for every low result.

Why are testosterone levels declining?

Population-level testosterone has declined approximately 1% per year since the 1980s, independent of aging. A 2007 study by Travison et al. in the Journal of Clinical Endocrinology & Metabolism showed that a 65-year-old man in 2004 had roughly 15% lower testosterone than a 65-year-old man in 1987. Contributing factors include rising obesity rates, endocrine-disrupting chemicals (BPA, phthalates, PFAS), chronic sleep deprivation, sedentary lifestyles, and chronic psychological stress.

How do I get my testosterone levels tested?

A comprehensive testosterone evaluation requires a morning blood draw (testosterone peaks between 7-10 AM) testing total testosterone, free testosterone, SHBG, estradiol, LH, FSH, DHEA-S, prolactin, CBC, metabolic panel, and thyroid markers. At Moonshot Medical in Park Ridge, IL, our comprehensive blood panel covers 60+ biomarkers including all of these for $285. Most primary care doctors only test total testosterone, which gives an incomplete picture.

What is SHBG and why does it matter?

SHBG (sex hormone-binding globulin) is a protein produced by the liver that binds to testosterone, making it inactive. SHBG increases with age, meaning a larger percentage of your total testosterone becomes unavailable as you get older. High SHBG explains why some men with "normal" total testosterone of 500 ng/dL still experience low-T symptoms — their free testosterone is low because SHBG is binding most of it. Factors that raise SHBG include aging, liver disease, hyperthyroidism, and low caloric intake. Testing SHBG alongside total T and free T is the only way to get an accurate picture of your testosterone status.