Why We Lose Muscle as We Age — and What We Can Do About It

What happens to our muscles as we age?

Muscle mass generally reaches its peak in early adulthood. From approximately our 30s onwards, gradual age-related changes may begin, although the timing and rate vary considerably between individuals.

As we get older, we can experience changes in three related areas:

• Muscle mass: The amount of muscle tissue we have.
• Muscle strength: How much force our muscles can produce.
• Muscle function: How effectively we use our muscles to move and perform everyday activities.

These aren't quite the same thing. Someone might maintain a reasonable amount of muscle but still experience a decline in strength, because strength also depends on muscle quality and how effectively our nervous system activates our muscles.

Changes often become more noticeable in later life, particularly when combined with inactivity or illness. More substantial losses of muscle strength and function can be associated with a condition called sarcopenia, but ordinary age-related changes don't automatically mean someone has this condition.

Getting older doesn't mean we have to accept becoming progressively weaker without doing anything about it.

Why do we lose muscle and strength?

There's no single cause. Ageing involves several changes, and our lifestyles can influence how these affect us.

We may simply use our muscles less

Think about how much time we spend sitting — at work, in the car, watching television or using our phones. Many everyday activities now require less physical effort than they once did.

Our muscles adapt to the demands we place on them. When they're rarely challenged, there's less stimulus to maintain strength. You've probably heard the expression “use it or lose it”. It's a useful reminder, although ageing-related muscle loss is more complicated than inactivity alone.

Our muscles naturally change

Ageing can affect muscle fibres, muscle quality and the nerves that help our muscles contract. These changes can influence how much force our muscles produce, but they don't mean our muscles stop adapting. Strength training can still produce meaningful improvements in older adults.

Illness and inactivity can make things worse

A period of illness, injury or prolonged bed rest can cause strength and physical capacity to decline. Recovering afterwards may be harder when someone already has low strength or limited mobility.

Food and recovery matter too. Rather than viewing exercise, nutrition and recovery as separate subjects, it's useful to understand that they support one another.

Why does maintaining muscle matter?

When people hear the words building muscle, they sometimes imagine bodybuilding or lifting heavy weights. But maintaining muscle isn't primarily about appearance. It's about keeping our bodies capable.

Everyday independence

Getting out of bed, standing up from a chair, carrying shopping, climbing stairs or lifting something from the floor all rely on muscular strength. Maintaining strength can help us continue doing everyday tasks comfortably and independently.

Mobility and confidence

Strength contributes to walking, climbing steps and controlling our movements. Together with appropriate balance training, it can also help reduce the risk of falls, particularly in older adults.

Enjoying the things that matter

Gardening, walking holidays, travelling, cycling or playing with grandchildren might not feel like exercise, but they still depend on our bodies being strong enough to do them.

Maintaining strength is about protecting our ability to enjoy life, not just improving what we can do in a workout.

Muscle and metabolic health

Our muscles also have important jobs beyond movement. Skeletal muscle plays a major role in how our bodies use glucose for energy. Regular physical activity, including resistance training, can support insulin sensitivity and metabolic health.

That doesn't mean having more muscle automatically prevents illness. It means keeping our muscles active and functioning well is one part of looking after our wider health.

Can we slow down muscle loss?

Yes. Although we cannot stop ageing, we can influence how strong and physically capable we remain. Research shows that resistance training can improve muscle strength and physical performance in older adults, including people who have never trained before.

Resistance training simply means making your muscles work against a force. That force might come from your own bodyweight, a resistance band, dumbbells or gym equipment.

For example, standing up repeatedly from a chair can challenge your leg muscles. As that becomes easier, you can gradually make the movement more demanding.

Muscles need an appropriate challenge to maintain and develop strength. You don't need to begin with heavy weights or complicated exercises.

Isn't walking enough?

Walking is excellent for our health. It supports cardiovascular fitness, helps us stay active and can improve wellbeing. If you're already walking regularly, keep doing it.

But walking and strength training don't do exactly the same job. Walking challenges our ability to keep moving, particularly using our legs. An ordinary walk may not provide enough resistance to improve strength throughout the body — especially the muscles involved in pushing, pulling and lifting.

Walking helps us stay active. Strength training helps us maintain the physical capacity to move, lift, push, pull and carry.

The UK Chief Medical Officers recommend muscle-strengthening activities on at least two days each week, alongside regular aerobic activity. It's not about choosing one or the other.

How can you start maintaining and building strength?

The good news is that you don't need a gym membership, expensive equipment or previous exercise experience to begin.

Strength training simply means challenging your muscles against resistance, and that resistance can come from your own bodyweight.

For example, standing up repeatedly from a sturdy chair challenges your legs and hips. Wall push-ups work your upper body, while controlled calf raises help strengthen the muscles in your lower legs.

These might sound like simple movements, but for someone who's been relatively inactive, they can be a useful starting point.

As you become stronger, exercises need to become more challenging. That might mean gradually increasing repetitions, choosing more demanding movements or introducing resistance bands, dumbbells or gym equipment. This gradual progression helps your muscles continue adapting.

You don't have to do everything at once. Start at a level that suits your current abilities and build from there.

The aim isn't to become a gym enthusiast overnight. It's to make maintaining your strength a regular part of looking after yourself.

If you have an injury, a condition that affects exercise, significant balance difficulties or concerns about starting, seek appropriate professional guidance. Stop if you experience chest pain, dizziness or unusual symptoms.

Strength is only one part of the picture

Our muscles don't work in isolation. What we eat, how well we sleep, how much we move throughout the day and how consistently we look after ourselves all contribute to our overall health.

Protein helps our bodies maintain and repair muscle. Fibre-rich foods support digestive health and help nourish the gut bacteria that play important roles in our wider health. A varied, balanced diet provides the energy and nutrients our bodies need.

Rest and recovery matter too. Our muscles need time to adapt to the demands we place on them.

For more practical ideas, explore why meals may leave you hungry and how to build habits that last.

What does staying strong mean to you?

It's easy to think about fitness in terms of bodyweight, appearance or how much someone can lift. But perhaps a more useful question is:

Maybe it's walking comfortably on holiday, carrying your own luggage, getting up from the floor, gardening or staying active with your family. These aren't extraordinary athletic goals. They're everyday abilities that can make an enormous difference to quality of life.

You don't have to wait until you notice yourself becoming weaker before taking action. And if you've already noticed changes, that doesn't necessarily mean it's too late to improve.

The goal isn't to train like a bodybuilder. It's to give your muscles a reason to stay strong and useful throughout your life.

Where do you go from here?

Losing strength as we age isn't something we should simply ignore or accept without question. Ageing is unavoidable. Becoming inactive isn't.

You don't need to transform your lifestyle overnight, join a gym or buy lots of equipment. Start with movements you can manage, practise them regularly and gradually build from there.

A little progress, repeated consistently, can make a meaningful difference over time.