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

The most common question: is my testosterone level normal for my age? The answer is more complicated than a single reference range suggests, and the NHS reference range does not tell the full story.

Seb's Take

The number that finally helped me was not a snapshot but a trend. Three results over two years told me far more about what was happening to my own testosterone than any single visit to the GP.

The UK Reference Ranges

Most UK labs use a reference range of 8 to 29 nmol/L for total testosterone in adult men. The BSSM guidelines suggest a more useful clinical threshold: below 8 nmol/L is severe deficiency, 8 to 12 nmol/L is likely deficiency, 12 to 15 nmol/L is a grey zone, and above 15 nmol/L is within normal range.

Average Testosterone by Age Group

Based on data from the European Male Ageing Study:

| Age | Average Total T (nmol/L) | Average Free T (pmol/L) | |-----|--------------------------|------------------------| | 20 to 29 | 19 to 22 | 300 to 450 | | 30 to 39 | 17 to 20 | 260 to 400 | | 40 to 49 | 14 to 18 | 220 to 360 | | 50 to 59 | 12 to 16 | 180 to 300 | | 60 to 69 | 10 to 14 | 140 to 250 | | 70 and over | 8 to 12 | 100 to 200 |

The decline is approximately 1 to 2% per year from age 30. By age 45, a man who was at 20 nmol/L at 25 might be at 14 to 16 nmol/L, still in range by NHS standards but down 20 to 30% from his peak.

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Seb's Take

The charts show population averages. Your individual number matters more than your age bracket. I test every 6 months — the Medichecks kit is the easiest way to do this at home without a GP referral.

Why the Reference Range Is Misleading

The NHS reference range covers all men 18 to 80+. A 45-year-old at 12 nmol/L is at the bottom of the normal range, but that range includes 80-year-olds. More importantly, there is no universal normal testosterone level. There is YOUR normal. A man who peaked at 24 nmol/L at 28 and is now at 13 nmol/L at 44 has lost nearly 50% of his testosterone and may be symptomatic at a level another man would not be, because his baseline was different. This is why tracking matters more than any single measurement.

Free Testosterone Matters More Than Total

Up to 60% of testosterone is bound to SHBG and unavailable to cells. As men age, SHBG tends to increase, meaning a larger proportion of total testosterone becomes bound and inactive. A man with a total T of 18 nmol/L but high SHBG may have less free testosterone than a man with a total T of 13 nmol/L and normal SHBG. Always check free testosterone and SHBG if total T is borderline but you are symptomatic.

How and When to Test

Always test between 7 and 10am, fasting overnight. Testosterone peaks in the morning and drops 15 to 25% through the day.

For UK men, the best home testing options are Forth (best trend dashboard for quarterly tracking), Medichecks (widest catalogue), and Lola Health (home phlebotomy for venous accuracy, best for TRT monitoring).

Test at minimum annually. Quarterly if you are actively managing symptoms or on any protocol.

What to Do If Your Levels Are Low for Your Age

1. Get a full panel including free testosterone, SHBG, LH, FSH, prolactin, oestradiol, cortisol, and thyroid
2. Optimise lifestyle first: sleep, resistance training, body composition, stress management
3. Retest in 3 months
4. If still symptomatic and below 15 nmol/L, consider a referral to a TRT specialist

See our full guide to low testosterone symptoms in UK men and our comparison of the best TRT clinics in the UK.

Seb monitors testosterone quarterly. Data cited from the European Male Ageing Study and BSSM clinical guidelines.