Testosterone drops gradually from around your forties, by a little under one percent per year on average. That decline is normal, but the speed and your baseline differ per person. You measure it with your total and free testosterone, together with SHBG.
I think it is useful to know your baseline before the decline sets in. Then you see later whether a change fits your age or whether something else is going on.
How much does testosterone drop with age?
On average testosterone drops gradually from middle age. A long-running study in men found a decline of around 0.8 percent per year (Feldman, 2002). Over a decade that can become noticeable, certainly if your lifestyle also changes.
Important is that this is an average. One man drops faster than another, and your lifestyle weighs heavily.
Symptoms of a lower testosterone over the years
The complaints develop slowly and are vague, so they are easily attributed to your age. Commonly mentioned signs are less energy, slower recovery, declining muscle strength and a lower libido.
- Less energy and motivation
- Slower recovery after training
- Declining muscle strength and mass
- Lower libido
- Less sharp focus
None of these complaints proves a low testosterone on its own. Only a blood value completes the picture.
Which values do you measure?
You measure your total testosterone, your free testosterone and SHBG, the protein that binds testosterone. Together they show how much testosterone your body actually has available.
| Value | What it measures |
|---|---|
| Total testosterone | All the testosterone in your blood |
| Free testosterone | The directly available part |
| SHBG | The protein that binds testosterone |
Read the details about these values in free testosterone and SHBG. This article belongs to our guide healthy ageing as an athlete.
Age versus lifestyle
Not every decline comes from your age. Poor sleep, excess weight, a lot of stress and little strength training can push your testosterone down extra, apart from the years. So the decline is partly in your own hands.
That makes your lifestyle an important knob to turn. Read what really works in increasing testosterone naturally.
What can you do about it?
The base is lifestyle: strength training, enough sleep, a healthy weight and enough of the right nutrients. Those factors support your hormone balance in a natural way. Only with a clear and symptomatic deficiency does a medical route come into view, and that belongs with a doctor.
If you want to follow your hormones, choose the TRT monitoring blood test or the broader pillar testosterone: symptoms and blood values.
A deviating value you always discuss with your doctor. They weigh your whole picture before anything changes.
Testosterone, muscle mass and recovery over the years
Testosterone supports your muscle growth and your recovery, so a gradual decline can subtly affect your training result. Many athletes notice after forty that recovery takes a little longer and that building strength costs more work. That is partly hormonal, partly a matter of lifestyle.
The good news is that strength training is one of the strongest stimuli for your hormone balance. By continuing to train you keep your muscle mass and your recovery in better shape.
So it works in two directions: your hormones support your training, and your training supports your hormones. That interplay makes lifestyle increasingly important over the years.
Read how strength training affects your hormones in the pillar testosterone: symptoms and blood values.
When is a low value a problem?
A lower testosterone over the years is not automatically a problem that needs treatment. It comes down to the combination of your value and your complaints. If you have a clearly low value together with persistent symptoms, that is a reason for a talk with your doctor.
If you have a somewhat lower value but feel fine, there is often no reason to worry. The value alone does not tell the whole story.
That is why your baseline and the trend over the years are so valuable. A one-off measurement without context can mislead.
Always leave the interpretation and any treatment to your doctor, who weighs your whole picture.
References
- Feldman HA, Longcope C, Derby CA, et al. Age trends in the level of serum testosterone and other hormones in middle-aged men: longitudinal results from the Massachusetts male aging study. Journal of Clinical Endocrinology and Metabolism. 2002;87:589-598. PMID: 11836290.
- Gezondheidsraad. Nutrition, exercise and hormonal health. Accessed 2026.
- Thuisarts.nl / NHG. Male hormones. Accessed 2026.
Disclaimer
Every blood test result includes a professional assessment by a BIG-registered doctor. This article gives general information and is not a substitute for medical advice. A blood test is a tool to walk into the conversation with your GP better informed, not a diagnosis in itself. For treatment decisions, discuss your results with your GP.
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