When does your muscle strength start to decline?
Muscle strength reaches its peak somewhere between your thirties and forties and gradually declines after that. Regularly training your muscles with weights or resistance is the most effective way to slow that decline.
Muscle strength builds up during early adulthood and reaches its peak somewhere between your thirties and forties. On average, men peak at around 50 kg of hand-grip strength, women at around 30 kg.
After that, strength gradually declines. This pattern shows up in studies involving people from dozens of countries, so it is very consistent. By the age of eighty, roughly one in four men and one in four women have dangerously low muscle strength.
That decline has consequences: people with weak muscle strength later in life more often face disability, illness, and a shorter life expectancy. Whether weak strength causes this or whether it is a sign of a broader health condition has not been proven, but the link has been studied widely.
Want to delay the decline for as long as possible? Regularly training your muscles with weights or resistance is the best-proven way to maintain or improve muscle strength, even if you only start in your forties or fifties. You need not see the peak as a turning point, but rather as a signal to actively keep your strength up.
This answer is based on large population studies involving hundreds of thousands to millions of participants, brought together in a broad combined analysis and several comprehensive overviews. The findings reflect associations measured by following people over time, not studies where participants were randomly assigned to groups. The peak age and the subsequent decline are remarkably consistent across these studies; the relationship with illness and early death is strong, but whether weak muscle strength is the cause or a consequence of broader health problems remains uncertain.
How much muscle strength do you lose per year after the age of fifty?
After the age of fifty, you can quickly lose 3 to 4% of leg strength per year, far more than muscle mass alone would suggest. Strength training, combined with adequate protein intake, is the most effective way to counter this.
How quickly do I lose fitness if I stop exercising for a while?
A period of training protects your fitness for a while after you stop, but the older you are, the faster that effect fades. Start moving again as soon as possible to hold on to what you have built up.
Can you regain lost muscle mass in later life?
Yes, regaining lost muscle mass in later life is possible, but the earlier you start, the better the outcome. Resistance training is the cornerstone; adequate protein intake (approximately 1.2-1.6 g/kg/day) makes the effect somewhat greater.
How do I know if I am losing too much muscle mass (sarcopenia)?
A calf circumference below 33 cm or a slow walking speed are good reasons to ask your GP about a grip strength test and muscle mass measurement. You can use these as a first check at home, but a definitive diagnosis requires measurement by a doctor.
How much rest do my muscles need between workouts as I get older?
Getting older does not call for more rest, but for more regular training: at least two resistance-training sessions per week, supplemented with adequate protein, is the best-supported approach for counteracting muscle loss.
Why is muscle strength so important for healthy ageing?
Muscle strength is one of the best-supported pillars of healthy ageing: losing it increases the risk of falls, disability and premature death, while resistance training demonstrably reduces those risks. So do regular strength exercises, and if you are unsure how, discuss it with a physiotherapist.