Normal Testosterone Levels in Men by Age
By TRT NYC Editorial Team
Normal testosterone levels in men are roughly 300 to 1,000 ng/dL for total testosterone, though the exact reference range varies by lab. Levels peak in the 20s and decline about 1% per year after age 30. A result below 300 ng/dL with symptoms is generally considered low. Here’s the normal range, how it changes by age, and which numbers actually matter.
“Is my testosterone normal?” is one of the most common questions men have and the answer has nuance. Reference ranges differ between labs, total and free testosterone tell different stories, and your personal baseline matters as much as the population average. This guide explains what’s normal, what’s low, and how to read your result. (For treatment options if you’re low, see our complete TRT guide.)
What Are Normal Testosterone Levels in Men?
For most adult men, normal total testosterone falls roughly between 300 and 1,000 ng/dL (nanograms per deciliter). The American Urological Association uses 300 ng/dL as the common threshold below which, combined with symptoms, testosterone is considered low. Important caveat: every lab sets its own reference range based on its testing method, so always compare your number to the range printed on your report not a generic figure online.
Normal Testosterone Levels by Age
Testosterone changes across life high in young adulthood, then a slow decline. Here’s the general pattern (approximate; labs vary):
| Age range | Typical total testosterone (general pattern) |
|---|---|
| Late teens–20s | Highest — lifetime peak |
| 30s | Still strong; gradual decline begins (~1%/yr) |
| 40s | Noticeably lower than peak for many men |
| 50s | Lower still; symptoms more common |
| 60s+ | Lowest; wide individual variation |
These are general trends, not strict cutoffs a healthy 50-year-old can have higher testosterone than an unhealthy 30-year-old. For a detailed breakdown, see our testosterone levels by age chart.
Total vs Free Testosterone: Which Number Matters?
Your “total testosterone” includes hormone that’s bound to proteins (mostly inactive) plus a small amount that’s free and usable. Free testosterone is the active form your body actually uses, so a normal total with low free testosterone can still cause symptoms. This is why a good panel measures both, plus SHBG (the protein that binds testosterone). Learn more in free vs total testosterone and what is SHBG.
What’s Considered Low? What’s High?
- Low: total testosterone consistently below ~300 ng/dL with symptoms like fatigue, low libido, or brain fog is generally classified as low (hypogonadism). A single low reading isn’t a diagnosis, it needs a repeat morning test. Wondering about a specific number? See is 400 testosterone low.
- High: levels above the normal range are uncommon naturally and usually point to supplementation or a medical issue, worth investigating with a doctor.
- Symptoms matter: the same number can be “fine” for one man and symptomatic for another, depending on his baseline. Check the low testosterone symptoms.
How Testosterone Naturally Declines With Age
After about age 30, men lose roughly 1% of their testosterone per year on average. This is gradual and normal but for some men it adds up to symptomatic low testosterone by their 40s or 50s. The Endocrine Society distinguishes this normal age-related decline from true hypogonadism that warrants treatment. Lifestyle (sleep, weight, stress, exercise) strongly influences how fast you decline.
How to Test Your Testosterone Accurately
Your number is only as good as how you tested it. For an accurate reading:
- Test in the morning (7–10 AM), when testosterone peaks, see the best time to test testosterone.
- Confirm low or borderline results with a second morning test.
- Measure total and free testosterone (and SHBG), see which testosterone test you need.
- You can start at home with an at-home testosterone test kit, then confirm with a provider.
What to Do If Your Levels Are Low (or High)
A low or high result is a starting point, not a verdict. If you’re low with symptoms, see a licensed provider for a full evaluation and to discuss options like TRT. If you’re high, get it investigated. And if you’re normal but symptomatic, look at sleep, stress, weight, and other causes, testosterone may not be the issue. Never self-treat based on a single number.
The Bottom Line
Normal testosterone levels in men run roughly 300–1,000 ng/dL, peak in the 20s, and decline about 1% per year after 30 — but your lab’s reference range, your free testosterone, and your symptoms all matter more than a generic number. Test in the morning, check both total and free testosterone, and interpret results with a doctor rather than guessing.
👉 Curious where you stand? Check your levels with an at-home testosterone test kit, and if they’re low, review the low testosterone symptoms and your treatment options.
Frequently Asked Questions
What is a normal testosterone level for a man?
Normal total testosterone is roughly 300 to 1,000 ng/dL, though the exact range varies by lab. Below 300 ng/dL with symptoms is generally considered low. Always compare your result to your lab’s printed reference range.
What is a normal testosterone level by age?
Testosterone peaks in the late teens and 20s, then declines about 1% per year after 30, so levels are typically lower in the 40s, 50s, and beyond. There’s wide individual variation, and a healthy older man can have higher levels than an unhealthy younger one.
Is 400 ng/dL low?
400 ng/dL is within the normal range for most labs, so it’s not technically “low.” But if you have clear symptoms and your baseline used to be much higher, it can still feel low, symptoms and your personal trend matter alongside the number.
What is a normal free testosterone level?
Free testosterone is the active form, and normal ranges vary by lab and units (often a small percentage of total). Because a normal total can hide a low free level, it’s best to interpret free testosterone alongside total and SHBG with your provider.
At what level is testosterone considered low?
Total testosterone consistently below about 300 ng/dL, combined with symptoms, is generally classified as low (hypogonadism). A single low reading isn’t enough, it should be confirmed with a repeat morning test.
Do normal testosterone levels change with age?
Yes. Testosterone naturally declines roughly 1% per year after age 30, so normal levels trend lower as men age. This gradual decline is normal and different from true hypogonadism, which involves low levels plus symptoms.
Written by the TRT NYC Editorial Team. Reviewed against current clinical guidelines (American Urological Association; Endocrine Society). Last updated: June 2026.
Medical disclaimer: This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Reference ranges vary by laboratory. trtnyc.com is an independent informational resource, not a medical provider. Always interpret lab results with a licensed healthcare provider.