Low testosterone: age‑related changes and when it may matter

As men get older, it’s normal for testosterone levels to decline gradually over time. Research and clinical guidance used by the NHS suggest that, on average, testosterone levels fall slowly from around the age of 30–40 onwards, typically by around 1% per year.

This gradual change is a normal part of ageing for many men and does not usually cause significant problems.

If you’re interested in understanding what testosterone does more broadly in the body, how levels are measured, and when blood testing might be useful, you may find our guide to testosterone and testosterone blood tests helpful.

You may sometimes see this process described as “andropause” or “male menopause”. These terms are often used in the media but can be misleading. Unlike menopause in women – which marks a clear and relatively sudden change in reproductive hormones – hormonal changes in men are usually slow, variable and far less dramatic.

For most men, age‑related testosterone decline does not result in a medical condition or require treatment.

Low testosterone and medical conditions

In a smaller number of cases, testosterone levels can fall below the normal range for age and sex and be associated with persistent symptoms. This condition is known medically as testosterone deficiency or hypogonadism.

It’s important to distinguish between:

• Normal, gradual age‑related decline, which most men experience, and

• Clinically significant testosterone deficiency, which is less common and requires medical assessment

Current UK guidance is clear that hypogonadism is diagnosed only when low testosterone levels are confirmed on blood testing and are accompanied by relevant symptoms. Many men with symptoms commonly linked to low testosterone are found to have hormone levels within the normal range.

What testosterone does in the body

Testosterone is the primary male sex hormone and plays an important role in several functions, including:

• Maintaining muscle mass and strength

• Supporting bone density

• Regulation of fat distribution

• Red blood cell production

• Sex drive (libido) and sexual function

• Overall energy levels and wellbeing

The effects of changing testosterone levels differ from person to person, and not all men will notice any symptoms as levels decline.

Possible symptoms linked with low testosterone

Symptoms that may be associated with low testosterone include:

• Reduced libido (sex drive)

• Erectile dysfunction or difficulty achieving or maintaining erections

• Persistent fatigue or low energy

• Reduced muscle mass or strength

• Increased body fat

• Mood changes, such as low mood or irritability

• Poor sleep or sleep disturbances

• Reduced bone density

• Reduced motivation or drive

• Fertility issues

These symptoms are not specific to testosterone deficiency and can be caused by a wide range of physical, psychological and lifestyle‑related factors. If symptoms are ongoing or affecting quality of life, it’s important to explore the underlying cause rather than assuming hormones are responsible.

Lifestyle factors and testosterone

Healthy lifestyle choices can have a significant impact on overall wellbeing and may help reduce or manage symptoms that are sometimes associated with hormonal changes. This includes:

• Eating a balanced, nutritious diet

• Regular physical activity

• Getting enough good‑quality sleep

• Managing stress and making time for rest and enjoyment

These measures are beneficial for everyone and form the foundation of good health, regardless of testosterone levels.

Treatment considerations

In cases where testosterone deficiency is confirmed, further investigation and treatment options may be considered under medical supervision. This can include testosterone replacement therapy in appropriate circumstances. For some people, treatments such as antidepressants may be considered where mood symptoms are the primary concern.

Any decision about treatment should always be made in discussion with a GP or specialist, taking into account symptoms, test results, medical history and potential risks and benefits.

Health screening at All Health Matters

At All Health Matters, we offer private blood tests and screening packages designed to give you clearer insight into your health. These include:

• Testosterone Blood Test

• Advanced Well Man Blood Test

• Premium Complete Blood Test

Blood testing can be a helpful way to gather objective information and understand whether further discussion or reassurance is needed.