Your Body Has Its Own Birthday: What Glucose, Inflammation, Muscle and Fitness Can Tell You About Ageing

Two people can be the same age and have very different health profiles.

Imagine two women, both aged 52. One has healthy blood glucose levels, good muscle strength and strong cardiovascular fitness. The other has rising blood glucose, reduced muscle strength and declining fitness.

They share the same chronological age, but their health risks and physical capabilities may look quite different.

This is one reason why your birthday does not tell the whole story about your health.

During perimenopause and menopause, changes in hormones, body composition, sleep and metabolism can influence how you feel and function. Understanding these changes can help you make informed decisions about your health, both now and in the years ahead.

So, what can your blood tests, muscle strength and cardiovascular fitness tell you about how your body is ageing?

What Does Biological Age Actually Mean?

Chronological age is how many years you have lived. Biological age is a broader concept used to describe how your body's systems are functioning relative to patterns associated with ageing.

Researchers are exploring different ways to estimate biological age using combinations of blood markers, physical function, body composition and other measures. However, there is currently no single test that can accurately tell you how old your body is in biological terms.

Instead of focusing on one number, it can be more useful to understand the factors that influence your long-term health.

Four important areas to consider are:

• Glucose regulation: How your body manages blood sugar.

• Inflammation: Whether there are signs of ongoing inflammation that need further assessment.

• Muscle mass and strength: How well you maintain strength, mobility and physical function.

• Cardiovascular fitness: How efficiently your heart, lungs and muscles work together during physical activity.

These measures do not provide a definitive biological age. They can, however, help build a clearer picture of your health and identify areas where personalised support may be beneficial.

Glucose Control: Understanding Your Metabolic Health

Your body needs to regulate blood glucose carefully to provide energy to your cells. Insulin helps move glucose from your bloodstream into your cells, where it can be used or stored.

When your body becomes less responsive to insulin, known as insulin resistance, it may need to produce more insulin to help maintain normal blood glucose levels.

This process can develop gradually. Blood glucose results may remain within the reference range for some time, which is why your overall metabolic risk needs to be considered rather than relying on one result alone.

During midlife, changes in body composition, physical activity, sleep and hormonal patterns may influence metabolic health. Menopause is also associated with changes in fat distribution and cardiovascular risk, although these changes vary between individuals.

Which tests can help assess glucose regulation?

Depending on your health history and risk factors, a healthcare professional may consider:

• Fasting blood glucose: Measures your blood glucose after a period without food.

• HbA1c: Provides an estimate of your average blood glucose over approximately two to three months.

• Fasting insulin: May provide additional information in selected circumstances, although it is not routinely required for everyone.

• HOMA-IR: A calculation using fasting glucose and insulin that is sometimes used to estimate insulin resistance. It is not a standalone diagnostic test and is not interpreted using one universal threshold.

Continuous glucose monitoring may also be useful in selected clinical situations, but it is not necessary for everyone and should not be used alone to diagnose insulin resistance.

What can you do to support metabolic health?

The encouraging news is that metabolic health can often be improved through practical, sustainable changes.

Regular physical activity, resistance training, balanced meals, adequate sleep and attention to cardiovascular risk factors can all contribute to better metabolic health. Some people may also benefit from medication, depending on their individual circumstances.

The aim is not to chase perfect numbers. It is to understand your results in context and identify the steps most likely to support your health.

Inflammation: Looking Beyond How You Feel

Inflammation is part of the body's normal response to injury and infection. It helps protect us and supports healing.

However, persistent inflammation can be associated with a range of health conditions, including cardiovascular and metabolic disease.

Chronic inflammation does not always cause noticeable symptoms. At the same time, fatigue, joint discomfort or digestive symptoms do not automatically mean that inflammation is present. These experiences can have many different causes and deserve appropriate assessment.

Which markers can provide useful information?

One test that may be considered in selected circumstances is:

• High-sensitivity C-reactive protein (hs-CRP): Measures low levels of C-reactive protein in the blood and can help assess cardiovascular risk in some situations. It is a non-specific marker, meaning that an elevated result does not identify the cause of inflammation.

Other tests, including a full blood count, erythrocyte sedimentation rate or additional investigations, may be appropriate depending on your symptoms and medical history.

Homocysteine and uric acid are sometimes discussed in relation to cardiovascular or metabolic health, but they are not universal measures of biological ageing. Their usefulness depends on the clinical question being investigated.

What influences inflammation?

Many factors can influence inflammatory processes, including infections, some medical conditions, smoking, inadequate sleep and excess visceral fat. Metabolic health and physical activity also play a role.

Supporting your overall health through regular movement, a varied and balanced diet, restorative sleep and appropriate management of existing conditions can be beneficial.

If a blood test shows an elevated inflammatory marker, the next step is to understand why. The result should be interpreted alongside your symptoms, medical history and other findings rather than treated as a problem in isolation.

Muscle Mass and Strength: Protecting Your Future Independence

Muscle does much more than help you lift weights or feel stronger.

It plays an important role in glucose regulation, balance, mobility and the ability to carry out everyday activities. Maintaining muscle strength can also help protect your independence as you get older.

Ageing is associated with gradual changes in muscle mass and strength. For women, midlife can be an important time to pay attention to these changes, particularly as menopause and ageing can coincide with shifts in body composition.

However, muscle loss is not inevitable at a fixed rate. Your physical activity, nutrition, health conditions and other individual factors all influence how your muscles change over time.

How can muscle health be assessed?

There are several ways to assess muscle health, depending on your circumstances:

• Grip strength: A practical measure of muscle strength that can provide useful information about physical function.

• Functional assessments: Tests of activities such as standing from a chair, walking or maintaining balance can help assess mobility and strength.

• Body composition assessment: Certain methods can estimate lean tissue and fat mass.

• DEXA scan: Measures bone mineral density and can also estimate body composition. It is not required routinely for everyone simply to assess muscle health.

No single measurement tells the whole story. Strength, function, activity levels and your ability to manage everyday tasks are all important.

How can you maintain muscle during midlife?

Resistance training is one of the most useful ways to build and maintain muscle. This could include weights, resistance bands, bodyweight exercises or a suitable strength program developed with a qualified exercise professional.

Nutrition matters, too. Adequate protein, sufficient overall energy intake and a balanced diet support muscle maintenance and recovery. Individual protein needs vary, particularly if you have kidney disease or other health considerations.

If you are noticing a decline in strength or exercise tolerance, it is worth discussing this with your healthcare professional. Thyroid disorders, nutritional deficiencies, medication effects and other health conditions may sometimes contribute to changes in muscle function.

The goal is to build a foundation that supports your strength, mobility and quality of life for years to come.

Cardiovascular Fitness: An Important Part of Healthy Ageing

Cardiovascular fitness describes how well your heart, lungs and muscles work together to deliver and use oxygen during physical activity.

It is an important indicator of overall health. Research has consistently linked higher cardiorespiratory fitness with better health outcomes and a lower risk of premature death.

The good news is that fitness can improve at different ages and starting points. You do not need to be an athlete to benefit from becoming more active.

What can help assess cardiovascular fitness?

Depending on your goals and health status, useful measures may include:

• Cardiorespiratory fitness or VO₂ max: Estimates or measures how effectively your body uses oxygen during exercise. Testing may be available in clinical or exercise settings, but it is not necessary for everyone.

• Resting heart rate: Can provide useful information when considered alongside other health measures and trends over time.

• Exercise tolerance: How comfortably you manage activities such as walking uphill, climbing stairs or cycling.

• Heart rate recovery: How quickly your heart rate falls after exercise. This can offer additional information in some settings, but it is influenced by several factors.

These measures should be interpreted in context. A wearable device can help track activity and trends, but its estimates are not a substitute for a clinical assessment when one is needed.

How can you support cardiovascular fitness?

A combination of regular aerobic activity and strength training can help support cardiovascular and metabolic health.

Walking, cycling, swimming and dancing are all options. You can start with activity that feels manageable and gradually build duration and intensity as your fitness improves.

Some people may benefit from more structured training, including moderate-intensity continuous exercise or intervals. The right approach depends on your current fitness, preferences and medical history.

Consistency matters. Small amounts of regular movement can build into meaningful improvements over time.

If you have chest discomfort, unexplained shortness of breath, dizziness or other concerning symptoms during exercise, seek medical advice rather than pushing through them.

Why These Four Areas Matter During Perimenopause and Menopause

Hormonal changes during the menopause transition can coincide with changes in body composition, blood lipids, glucose regulation, sleep and physical activity.

These changes do not happen in exactly the same way for every woman. Your health history, genetics, lifestyle, medications and other factors also influence your risk.

Looking at metabolic health, inflammation, muscle strength and cardiovascular fitness together can provide a more useful picture than focusing on weight alone.

For example, improving muscle strength through resistance training can support physical function and help your body manage glucose. Regular aerobic activity can improve cardiovascular fitness and contribute to metabolic health. Better sleep may also make it easier to maintain activity levels and manage everyday demands.

These systems interact, but there is no single intervention that guarantees a particular biological age or prevents all age-related conditions.

A personalised approach considers which factors matter most for you and what changes are realistic, safe and worthwhile.

The Goal Isn't to Be Younger. It's to Support Your Future Health

Your birthday tells you how long you have lived. It does not tell you everything about your current health, physical capacity or future health risks.

There is growing interest in biological-age testing, but the science is still developing. Different tests measure different things, and no single biological-age score can reliably predict an individual's lifespan or provide a complete picture of their health.

You do not need an expensive longevity panel to begin looking after your future health.

Depending on your circumstances, a more useful starting point may be reviewing your blood pressure, cholesterol, blood glucose, family history, physical activity, muscle strength and other established health indicators with your healthcare professional.

From there, you can identify practical next steps based on your needs and priorities.

At My Menopause Clinic Australia, we believe that understanding your health should help you feel informed and supported, not overwhelmed by another list of numbers to chase.

If you are experiencing changes in your weight, energy, strength or overall wellbeing during perimenopause or menopause, a personalised assessment can help explore the factors that may be contributing.

Your health is more than a number. Let's look at the whole picture.

Book a consultation with My Menopause Clinic Australia to discuss your concerns, review relevant health markers and explore an individualised approach to supporting your metabolic and long-term health.

Medical note: This article is for general educational purposes and does not replace individual medical advice. Not every test discussed is necessary or appropriate for every person. Testing should be guided by your symptoms, medical history and clinical assessment.