By Samantha Knupp, MSc | Published 28 January 2026
Read about our research approach here.
What is age-related muscle loss?
From about age 30 onwards, there is a progressive loss of muscle mass which is estimated to be between 3-8% per decade [1]. By age 80, you may have 50% of the muscle mass you had before [2]. This occurs for numerous reasons including a natural age-related decline, a reduction in physical activity levels, insufficient intake of protein and hormonal changes that result in less signal for muscle maintenance.
Why is this a concern? Muscle is commonly thought of as something sought after by body-builders and avid gym goers, primarily for aesthetic purposes (and bragging rights?). However, muscle is so much more than that.
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Firstly, muscle is responsible for the strength and mobility you need to move around independently and perform daily tasks. You may notice you struggle climbing stairs, getting up off the floor, opening jars or carrying groceries. These are clear signs that your strength is waning, and will only get worse without action, until you may be unable to get up off a chair easily, or even walk around without help.
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Secondly, muscle is a major metabolic organ that plays a large role in maintaining your metabolic health. It is a major sink for blood sugar, and also releases numerous signalling molecules that regulate the health of your body, and brain!
But here is the good news: scientific research has consistently proven that this loss is not inevitable. The decline in muscle mass and strength can be slowed, stopped and even reversed. It requires a powerful, two-part strategy that can be implemented at any time (it is never too late) but the best time to start is now.
The Two Pillars of Lasting Strength
The most effective way to combat age-related declines in muscle mass and strength is through a combination of targeted nutrition and resistance exercise. Where nutrition provides the building blocks, exercise provides the stimulus for growth.
Resistance Exercise: Building the Engine
Resistance training is the most effective tool for maintaining and building muscle mass and strength throughout life, and is particularly important to counteract the effects of aging.
Resistance training (strength training) refers to the intentional use of the muscles working against an external force. This force can be your own bodyweight, resistance bands, or weights (like dumbbells).
It is necessary to challenge the muscles to provide a stimulus for them to stay strong, or become stronger. Muscle is a very metabolically active organ, making it “expensive” for the body to maintain. If it is not used, it will be lost (use it or lose it).
This is not just conjecture, it is proven time and again by extensive amounts of high quality scientific research in older adults, including in women.
The Evidence
Countless clinical trials and meta-analyses have confirmed that resistance training is effective for building muscle mass and strength in older adults and provides numerous health benefits. Here are some key results:
Strength = Longevity
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Interestingly, greater muscle strength has been consistently associated with lower all-cause mortality, independent of muscle mass. Simply put: being stronger results in a lower chance of dying from any cause [3, 4].
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A massive review of almost 2 million participants identified that higher grip strength was associated with a 31% reduced risk of all-cause mortality. For women specifically, this reduction was even higher at 40% [5]. Note that grip strength is used as an overall measure of strength (a proxy) and that solely training your grip strength will not be effective for promoting long term health.
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Muscle mass matters too: Of course, some healthy amount of muscle mass is needed to be strong, and we also aim to improve health and quality of life, rather than just extending lifespan, which is where maintaining muscle mass is important as well. A recent study of almost 22 000 adults identified that individuals in the lowest 20% of muscle mass were associated with a 14% lower risk of all-cause mortality (and 13% lower risk of cancer mortality) [6].
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Muscle mass and strength ensures a healthy brain: Muscle is not just for strength and functionality. A massive meta-analysis of 31 studies involving over 540,000 participants observed that individuals with severe muscle loss (sarcopenia) or weakness had almost twice the odds of developing cognitive impairments compared to those with healthy muscle. This association was particularly strong in women [7].
Metabolic Health and Disease Prevention
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Metabolic syndrome: Sixteen weeks of resistance training in postmenopausal women significantly reduced the risk of metabolic syndrome by lowering fasting blood glucose and body fat percentage while increasing muscle mass [8].
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Mental wellbeing: Beyond the physical, resistance training improves self-esteem and cognitive ability while reducing anxiety and depression [1].
It Works for Everyone (Yes, Everyone)
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Menopause: A meta-analysis of 12 studies in postmenopausal women identified that resistance training consistently resulted in significant increases in upper and lower body strength, as well as maximal oxygen volume [9].
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Breast Cancer Survivors: These results are confirmed in postmenopausal breast cancer survivors [10].
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Frail and Elderly: It is never too late. Resistance training remains effective even in the oldest individuals (>80 years old) and counteracts changes in muscle contraction and breakdown. It is particularly effective for reducing risk of falls, and improving psychosocial well-being and quality of life. A systematic review identified consistent increases in strength and muscle mass in frail individuals following a resistance training program. In addition, there were vast improvements in functional capacity, for example the ability to get out of a chair, and walking speed [11].
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An umbrella review (analysing multiple meta-analyses and systematic reviews) found high quality evidence that resistance training improves muscle mass, strength and physical performance in individuals with severe loss of muscle mass [12]. It can even prevent further loss in those over 65 just beginning to experience decline [13].
The best way to train, according to science
There is often debate about the "best" way to train: heavy weights vs. light weights, or fast vs. slow. Here is what the evidence actually says.
Heavy or Lighter Weights?
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For Strength: To improve maximal strength (which is important when getting weaker or frail) lifting heavier loads is superior [12, 14, 15, 16].
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For Muscle Mass: It is likely that lifting lighter weights is just as effective for building muscle as heavy weights, provided you train to failure [16].
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The Takeaway: You don't have to lift heavy to build muscle, but if you choose light weights, you must work hard enough to tire the muscle out [16]. (Top tip: lifting lighter weights to failure will likely take more time, and increase your heart rate more…)
The Secret Ingredient: Power
While strength is how much you can lift, power is how fast you can lift it.
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Why it matters: We lose power almost twice as fast as we lose strength. You need power to catch yourself when you stumble.
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How to train it: Moving weights with higher velocity (lifting briskly) has been shown to be more effective than slow lifting for improving daily functional tasks in older women [17, 18].
Your Scientific Prescription
Based on guidelines from the National Strength and Conditioning Association [19] and recent reviews [20, 21], here is the Gold Standard for women 55+:
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Frequency: 2-3 time per week, although 3 times is often cited as superior for functional gains in women 60+
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Intensity: Moderate to Vigorous (70-85% of your max).
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Volume: 2-3 sets of 1-2 exercises per major muscle group.
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Reps: 5-8 repetitions is ideal for strength and fall prevention
Is it Safe?
Absolutely.
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Safety Record: Numerous studies on heavy lifting in elderly and frail individuals found no safety concerns or injuries when performed under supervision [11, 19, 22].
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Bone Health: Heavy resistance training is safe even for those with low bone mass and actually improves bone density [22].
Note: "Heavy" is relative to you. It simply means a weight that is challenging enough that you can only do about 8-12 reps.
Nutrition: Fueling the Engine
Maintaining muscle, strength and vitality requires fueling correctly and providing the right building blocks. There are a few critical requirements to consider:
Protein: the foundation:
Protein provides the literal building blocks for muscle tissue, and is an important component of bone as well. More than that, protein provides the materials for every single cell to build the components they need to function. This means not all protein will go to muscles immediately; your body prioritizes the essential components of cells for organs and survival first. This is why getting sufficient protein is important: to ensure there is enough left over to build your muscle as well.
There is an abundance of scientific evidence that shows that adequate protein and protein supplementation improves the results of resistance training [23, 24].
Combatting “anabolic resistance”
Protein requirements increase with age, to combat the decline in muscle mass and bone density. It is recommended that older adults consume up to 1.6g of protein per kg of bodyweight per day [25]. Unfortunately, older adults also experience “anabolic resistance” meaning that muscles become less sensitive to the stimuli that normally trigger growth (like eating protein or lifting weights).
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The role of leucine: To overcome this, it is advisable to consume a larger dose of protein at any given time, typically between 25-40g. This provides sufficient amounts of the amino acid leucine, which acts as the molecular "switch" to trigger muscle protein building [26].
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The role of Whey Protein: Getting enough protein in every meal can be difficult, especially if you are also managing caloric intake or your appetite is lower. This is where Whey Protein becomes a powerful tool.
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Why it works: Whey protein has a complete amino acid profile and is a high quality source of protein. It is also naturally high in leucine.
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The evidence: There is an abundance of scientific evidence showing that adequate protein intake and supplementation with whey protein improves the results of resistance training. A 2022 meta analysis in postmenopausal women found that whey supplementation significantly increased lean muscle mass and reduced fat mass [23]. Furthermore, in patients with severely low muscle mass, combining resistance training with resistance training was superior to training alone for improving functional performance [24].
Creatine, not just for gym bros
You may associate creatine with bodybuilders, but it is actually one of the most researched supplements in history for aging well. It works by fueling the energy cycle of your muscle cells, allowing you to perform short, intense bouts of exercise (like lifting weights) with more power.
The Evidence
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Vulnerable Populations: In a study of "vulnerable" older women, those who combined creatine with resistance training gained significantly more muscle mass and upper-body strength than those who trained without it [27].
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Overall Impact: A major meta-analysis of older adults confirmed that adding creatine to a training program increases lean tissue mass by an extra 1.37 kg on average compared to training alone [28].
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The European Food Safety Authority (EFSA) officially recognizes that for adults over 55, a daily intake of creatine can significantly enhance the muscle-strengthening effects of regular resistance training.
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How to take it: The commonly recommended dose is 3–5g per day, consumed with a full glass of water. It is safe, effective, and inexpensive.
Key Takeaways
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Strength is survival: Greater muscle strength and muscle mass are likely to increase your lifespan, and healthspan!
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Brain protection: Muscle tissue is neuroprotective, and so is exercising. Do it for your brain!
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Don't forget power: Don't just lift, sometimes lift briskly as well! Power declines twice as fast as strength and is crucial for preventing falls and for maintaining functionality.
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Fuel with purpose: To overcome age-related "anabolic resistance," older adults need more protein (up to 1.6g/kg/day), not less. Prioritize getting 25-40g of protein per serving and consider using creatine (3-5g daily) to maximize your results.
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It's never too late: Whether you are post-menopausal, a cancer survivor, or over 80, your body remains responsive to exercise. Studies show significant strength and functional gains even in frail individuals who start training later in life.
Weakness, frailty, cognitive decline and poor metabolic health are not inevitable! By including regular resistance training, and fueling properly, you can change the trajectory of your future. The best time to start is now.
