Testosterone Levels by Age — What's Normal at 30, 40, 50 and 60?

Testosterone does decline with age. The question is whether your decline is the normal background rate, or whether something is pulling it down faster than it should be going.

Here is what the data actually shows, decade by decade, and how to tell the difference.

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The decline is real, but slower than most men think

Testosterone peaks in late adolescence to early adulthood, typically between 17 and 25. From around 30, total testosterone declines at roughly 1 to 2% per year on average. By 70, a man will typically have 30 to 50% of the testosterone he had at 25.

That sounds significant, and it is. But the variation between individuals is large enough that a 60-year-old who has maintained good body composition, sleep, and low stress can have higher testosterone than a 35-year-old with obesity, poor sleep, and chronic stress.

Testosterone by decade, what the data shows

These are broad population estimates for total testosterone in healthy men. Individual variation is significant.

These ranges are approximations. A man in his 50s at 16 nmol/L with good body composition and no symptoms does not have a problem. A man in his 30s at 10 nmol/L with fatigue, poor libido, and declining muscle mass does, even though both might be technically within the NHS reference range.

The SHBG problem in older men

The reason free testosterone declines faster than total testosterone is SHBG. Sex hormone-binding globulin tends to rise with age, particularly after 40, and as SHBG rises it binds more of the circulating testosterone, leaving less available to cells.

This means a man at 45 with a total testosterone of 14 nmol/L and SHBG of 55 nmol/L has significantly less biologically active testosterone than a man of the same age with total testosterone of 14 nmol/L and SHBG of 25 nmol/L.

If your total testosterone looks reasonable but your symptoms do not match the number, SHBG is almost always part of the explanation. This is why a complete panel matters.

Seb's Take

I tested at 8.4 nmol/L at 38. Looked like a clinical problem until I factored in that my SHBG was 67, elevated, not from age, but from a period of significant work stress and disrupted sleep. The LH pattern confirmed secondary suppression. The number alone would have pointed me toward TRT. The full panel pointed me toward addressing what was actually causing the suppression first.

When to get tested

There is no single right age to start monitoring testosterone. As a practical guide:

First test: any time you want a baseline. If you are 30+ and have never had your testosterone tested, the Medichecks Advanced Male Hormone panel gives you a reference point to compare against over time. Knowing where you started is more useful than any single future reading in isolation.

If you have symptoms at any age: fatigue that does not improve with sleep, declining libido, difficulty maintaining muscle mass despite training, persistent low mood, reduced drive and motivation, test now regardless of age.

If you are over 40: testing every 2 to 3 years gives you trend data. One reading tells you where you are. Multiple readings over years tell you how quickly you are declining.

If you are on TRT or optimising a supplement protocol: monitor every 3 to 6 months. Changes you make to sleep, stress, training, and supplementation affect testosterone, and the only way to know whether your interventions are working is to test before and after.

What accelerates the decline

The 1 to 2% per year figure is an average across the population. Several factors can significantly accelerate it:

Obesity and visceral fat: aromatase activity in adipose tissue converts testosterone to oestradiol, reducing total and free testosterone. Body fat above 25% is strongly associated with lower testosterone.

Poor sleep: testosterone is synthesised primarily during deep sleep. Chronic sleep deprivation of 5 hours or fewer for a week can reduce testosterone by 10 to 15%.

Chronic psychological stress: cortisol and testosterone compete for the same precursor hormones. Sustained high cortisol consistently suppresses testosterone.

Excessive alcohol: alcohol is directly toxic to Leydig cells (which produce testosterone) and increases aromatase activity.

Overtraining without recovery: insufficient recovery time suppresses the HPG axis. More training without adequate sleep and nutrition does not increase testosterone, it reduces it.

At what point should you consider TRT?

Private TRT clinics in the UK generally consider treatment when: total testosterone is consistently below 10 to 12 nmol/L on morning fasted samples, symptoms are present and affecting quality of life, and lifestyle and supplementation options have been addressed.

A reading of 9 nmol/L on a single afternoon test is not a TRT indication. Two morning fasted readings of 9 nmol/L, combined with clear symptoms and a full hormone panel, is a different conversation.

If you have never had a comprehensive test, the full guide to home blood testing services in the UK covers all four main providers. If your results show genuinely low testosterone, the TRT clinic comparison covers costs, protocols, and what to expect.

Before you test

Test in the morning (before 10am if possible). Fast from the night before or have only a light breakfast. Avoid intense exercise in the 24 hours before testing. Do not test during illness.

If you are ordering a home finger-prick kit, the timing matters less than with a venous draw, but the same morning/fasted principles apply. For the most accurate possible reading, a venous draw at a clinic or via a home phlebotomy service gives better sample quality.

For a full breakdown of what each marker in your results means, the testosterone blood test results guide covers SHBG, LH, free testosterone, oestradiol, and how to interpret them together.

Further reading

• How to read your testosterone blood test results
• Best home blood tests for men UK 2026
• Best TRT clinics UK 2026
• Best testosterone support supplements UK
• Medichecks review, which panel to order and why

Affiliate disclosure: This article contains an affiliate link to Medichecks via Awin. If you purchase through this link, Male Optimal earns a small commission at no extra cost to you. This does not affect recommendations.